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A171451
a(n) = 2^C(n, 2) * 2^floor(n/3).
2
1, 1, 2, 16, 128, 2048, 131072, 8388608, 1073741824, 549755813888, 281474976710656, 288230376151711744, 1180591620717411303424, 4835703278458516698824704, 39614081257132168796771975168, 1298074214633706907132624082305024, 42535295865117307932921825928971026432
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
Sequence in context: A214623 A333719 A161737 * A012459 A012463 A037517
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Dec 09 2009
EXTENSIONS
More terms from Jinyuan Wang, Feb 25 2020
STATUS
approved