1,3

For even n, a(n)=0

Table of n, a(n) for n=1..22.

E.g.f. = sqrt(cosh(x))*exp(x^2/4)

Asymptotics (for even n): a(n)=exp(Pi^2/16)*(2^(n-2))*(n!)*(Pi^(-n))*n^(3/4)*(1+O(1/n))

A167028

Sequence in context: A073830 A213272 A053205 * A094030 A199573 A103424

Adjacent sequences: A167026 A167027 A167028 * A167030 A167031 A167032

easy,nice,sign

Pietro Majer, Oct 27 2009

approved