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

%I #11 Sep 26 2019 03:08:34

%S 1,2,16,120,882,6468,47680,354224,2652688,20008864,151853312,

%T 1158365824,8873772392,68219456080,526025997824,4066475337152,

%U 31505967787522,244574907064964,1901855959279776,14811829930479600,115514550050260068,901993060739459720

%N a(n) = A026301(n)/2^n.

%F a(n) ~ 2^(3*n + 1/2) / (Pi * sqrt(n)). - _Vaclav Kotesovec_, Sep 26 2019

%Y Cf. A065409, A026301, A060042.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, following a suggestion of _Peter J Larcombe_, Jan 16 2004

%E More terms from _Vaclav Kotesovec_, Sep 26 2019