E.g.f. satisfies A(x) = exp(x * (1 + x + x^2 + x^3) * A(x^4/24)).

A367756

E.g.f. satisfies A(x) = exp(x * (1 + x + x^2 + x^3) * A(x^4/24)).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =13a(4) =73a(5) =386a(6) =2671a(7) =20728a(8) =175393a(9) =1553968a(10) =15520861a(11) =165541806a(12) =1869485773a(13) =22249874518a(14) =284029764383

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