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%I #19 Jun 10 2024 10:03:42
%S 1,1,1,1,1,91,541,1891,5041,-22679,703081,9397081,59946481,510926131,
%T -1770628859,28435376971,879567081121,1118967005521,133425791669521,
%U -153681150137039,1206979480409761,974131304609110411,-2730300052811686739,68047061689139820211
%N Expansion of e.g.f. exp(x * (1 + x^4)^(3/4)).
%F a(n) = n! * Sum_{k=0..floor(n/4)} binomial(3*n/4-3*k,k)/(n-4*k)!.
%F a(n) == 1 mod 90.
%o (PARI) a(n) = n!*sum(k=0, n\4, binomial(3*n/4-3*k, k)/(n-4*k)!);
%Y Cf. A190877, A373524, A373525.
%Y Cf. A373521.
%K sign
%O 0,6
%A _Seiichi Manyama_, Jun 08 2024
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