a(n) = 2^n*floor(n/2)!*Gamma(ceiling((n+1)/2),-1/4)*exp(-1/4).

A277374

a(n) = 2^n*floor(n/2)!*Gamma(ceiling((n+1)/2),-1/4)*exp(-1/4).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =6a(4) =50a(5) =100a(6) =1794a(7) =3588a(8) =114840a(9) =229680a(10) =11483880a(11) =22967760a(12) =1653679440a(13) =3307358880a(14) =324121165200a(15) =648242330400

External references