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(n+1)!*(n+3)-3.
0

%I #8 Jun 19 2013 04:08:30

%S 5,27,141,837,5757,45357,403197,3991677,43545597,518918397,6706022397,

%T 93405311997,1394852659197,22230464255997,376610217983997,

%U 6758061133823997,128047474114559997,2554547108585471997

%N (n+1)!*(n+3)-3.

%F a(n) = A001048(n+2) - 3. - _Michel Marcus_, Jun 19 2013

%e a(2)=27 because 27=(2+1)!*(2+3)-3 or 3*2*1*5-3.

%o (PARI) a(n) = (n+1)!*(n+3) - 3 \\ _Michel Marcus_, Jun 19 2013

%K nonn,easy

%O 1,1

%A Andreas Ulvaer (aulvaer(AT)yahoo.com), Feb 20 2000

%E More terms from _James A. Sellers_, Feb 22 2000