A186941 a(n)=2^C(n,2)*(2(4^n-n*2^n)-1).

1, 3, 30, 632, 24512, 1768448, 243236864, 64959283200, 34084592025600, 35395409601888256, 73066365170086838272, 300608105396373834170368, 2468626449866096479911804928, 40500446023029046169942454435840, 1328092178371231300789305464410079232

Offset: 0

Author

Paul Barry, Mar 01 2011

Keywords

• nonn
• easy

Comments

Hankel transform of A186940.

Programs

Mathematica

Table[2^Binomial[n,2] (2(4^n-n*2^n)-1),{n,0,20}] (* Harvey P. Dale, Aug 04 2019 *)

Formula

a(n)=2^C(n,2)*A186942(n).