(C49) CHAR(U(N+3)+6*U(N+2)+12*U(N+1)+8*U(N),0,U,N,3,[U(0)=1,U(1)=-2,U(2)=
8]);
				   2
				  N    N	   N
(D52) 			  U(N) = (-- - - + 1) (- 2)
				  2    2

(C53) CHAR(U(N+1)-U(N),(1/6)*N*(N-1)*(N-2)+N-1,U,N,1,[U(0)=1]);
				 3    2
				N    N	  23 N	 7
(D58) 		      U(N) = N (-- - -- + ---- - -) + 1
				24   4	   24	 4

(C59) CHAR(U(N+2)-2*U(N+1)+U(N),N**2,U,N,2,[U(0)=0,U(1)=1]);
				    2
				2  N    N   5	  5 N
(D64) 		        U(N) = N  (-- - - + --) + ---
				   12   3   12	   6

(C65) GENF(U(N+2)-U(N),2**N,U,N,2,[U(0)=1,U(1)=0]);
				     N	        N
				    2	 2 (- 1)
(D71) 			     U(N) = -- + --------
				    3	    3

(C72) CHAR(U(N+2)-4*U(N),3+2*N,U,N,2,[U(0)=1,U(1)=0]);
				N	    N
			     7 2    25 (- 2)    2 N   13
(D77) 		      U(N) = ---- + --------- - --- - --
			      4	       36	 3    9

(C78) VARC1(U(N+1)-(N+1)*U(N),1,U,N,1,[U(0)=1]);
					N
				       ====
				       \       1
(D79) 			    U(N) = N!   >     ----
				       /      I6! 
				       ====
				       I6 = 0

(C80) VARC2(U(N+1)-(N+1)*U(N),1,U,N,1,[U(0)=1]);
			  N - 1		  N
			  /===\		 ====
			   ! !		 \	     1
(D80) 		  U(N) = ( ! !  (I + 1))  >    -------------
			   ! !		 /     I - 1
			  I = 1		 ====  /===\
					 I = 0  ! !
						! !  (J + 1)
						! !
					       J = 1