A046105 a(n) = A026301(n)/2^n.

1, 2, 16, 120, 882, 6468, 47680, 354224, 2652688, 20008864, 151853312, 1158365824, 8873772392, 68219456080, 526025997824, 4066475337152, 31505967787522, 244574907064964, 1901855959279776, 14811829930479600, 115514550050260068, 901993060739459720

Offset: 0

Author

N. J. A. Sloane, following a suggestion of Peter J Larcombe, Jan 16 2004

Keywords

• nonn

Crossrefs

Cf. A065409, A026301, A060042.

Formula

a(n) ~ 2^(3*n + 1/2) / (Pi * sqrt(n)). - Vaclav Kotesovec, Sep 26 2019

Extensions

More terms from Vaclav Kotesovec, Sep 26 2019