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(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
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