A229263 E.g.f.: Product_{n>=1} cosh(x^n).

1, 1, 13, 541, 32761, 3782521, 570649861, 126354119893, 34059666142321, 12697511966492401, 5418397453551516541, 2950382131846118771341, 1848796902719228099999593, 1394126061848631877574788201, 1187817128863650862040235107701, 1196980698779612997551160117313861

Offset: 0

Author

Paul D. Hanna, Sep 18 2013

Keywords

• nonn

Examples

			E.g.f.: A(x) = 1 + x^2/2! + 13*x^4/4! + 541*x^6/6! + 32761*x^8/8! +...
where
A(x) = cosh(x)*cosh(x^2)*cosh(x^3)*cosh(x^4)*cosh(x^5)*cosh(x^6)*...
		

Links

• Vaclav Kotesovec, Table of n, a(n) for n = 0..220

Crossrefs

Cf. A000262, A270294, A270662, A270663.

Programs

PARI

{a(n)=(2*n)!*polcoeff(prod(m=1,n,cosh(x^m +x*O(x^(2*n)))),2*n)}
for(n=0,20,print1(a(n),", "))