OFFSET
0,3
COMMENTS
Hankel transform of A171450.
FORMULA
a(n) = 2^A171452(n).
MATHEMATICA
Table[2^Binomial[n, 2] 2^Floor[n/3], {n, 0, 20}] (* Harvey P. Dale, Nov 20 2021 *)
PROG
(PARI) a(n) = 2^(n*(3*n-1)\6); \\ Jinyuan Wang, Feb 25 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Dec 09 2009
EXTENSIONS
More terms from Jinyuan Wang, Feb 25 2020
STATUS
approved