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 A086895 a(n) = 1/3!*(A000522(3*n) + 3*A000522(n) + 2). 1

%I #6 Jan 27 2020 18:49:34

%S 1,4,329,164410,217010257,592437912176,2900576017215049,

%T 23146596617368286854,281092269321320392419425,

%U 4933169326589172885999647452,120172004795712251502939402381001,3933950748992436265200224114943085394,168530450086835969601177601081838249796529

%N a(n) = 1/3!*(A000522(3*n) + 3*A000522(n) + 2).

%H Andrew Howroyd, <a href="/A086895/b086895.txt">Table of n, a(n) for n = 0..100</a>

%o (PARI) \\ here b(n) is A000522(n).

%o b(n)={sum(k=0, n, binomial(n, k)*k!)}

%o a(n)={(b(3*n) + 3*b(n) + 2) / 6} \\ _Andrew Howroyd_, Jan 27 2020

%Y Cf. A000522, A008290.

%K nonn

%O 0,2

%A _Vladeta Jovovic_, Aug 22 2003

%E Terms a(11) and beyond from _Andrew Howroyd_, Jan 27 2020

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Last modified August 6 00:15 EDT 2024. Contains 374957 sequences. (Running on oeis4.)