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

0,2

Comments

Hankel transform of A186940.

Links

Table of n, a(n) for n=0..14.

Formula

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

Mathematica

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

Crossrefs

Sequence in context: A092677 A007019 A327021 * A082879 A012007 A065753

Adjacent sequences: A186938 A186939 A186940 * A186942 A186943 A186944

Keyword

nonn,easy

Author

Paul Barry, Mar 01 2011

Status

approved