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a(n) = [x^n] (1/15! * Sum_{k=0..n} (k+15)!*x^k)^(1/8).
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%I #13 Apr 27 2018 10:31:20

%S 1,2,20,276,4544,84496,1723960,37906608,887437120,21930970336,

%T 568496401152,15384167213056,433012038646112,12640210696664768,

%U 381804410640552576,11911194405763099520,383211218811649633792,12698182733530048241152

%N a(n) = [x^n] (1/15! * Sum_{k=0..n} (k+15)!*x^k)^(1/8).

%H Seiichi Manyama, <a href="/A303616/b303616.txt">Table of n, a(n) for n = 0..439</a>

%o (PARI) N=66; x='x+O('x^N); Vec((1/15!*sum(k=0, N, (k+15)!*x^k))^(1/8))

%Y Cf. A303613, A303614.

%K nonn

%O 0,2

%A _Seiichi Manyama_, Apr 27 2018