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A186941 a(n)=2^C(n,2)*(2(4^n-n*2^n)-1). 2
1, 3, 30, 632, 24512, 1768448, 243236864, 64959283200, 34084592025600, 35395409601888256, 73066365170086838272, 300608105396373834170368, 2468626449866096479911804928, 40500446023029046169942454435840, 1328092178371231300789305464410079232 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Hankel transform of A186940.
LINKS
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
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Mar 01 2011
STATUS
approved

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Last modified February 25 19:44 EST 2024. Contains 370332 sequences. (Running on oeis4.)