OFFSET
0,2
COMMENTS
Hankel transform of A186940.
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
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Mar 01 2011
STATUS
approved