This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A171451 #10 Nov 20 2021 18:17:48
%S A171451 1,1,2,16,128,2048,131072,8388608,1073741824,549755813888,
%T A171451 281474976710656,288230376151711744,1180591620717411303424,
%U A171451 4835703278458516698824704,39614081257132168796771975168,1298074214633706907132624082305024,42535295865117307932921825928971026432
%N A171451 a(n) = 2^C(n, 2) * 2^floor(n/3).
%C A171451 Hankel transform of A171450.
%F A171451 a(n) = 2^A171452(n).
%t A171451 Table[2^Binomial[n,2] 2^Floor[n/3],{n,0,20}] (* _Harvey P. Dale_, Nov 20 2021 *)
%o A171451 (PARI) a(n) = 2^(n*(3*n-1)\6); \\ _Jinyuan Wang_, Feb 25 2020
%Y A171451 Cf. A171450, A171452.
%K A171451 nonn,easy
%O A171451 0,3
%A A171451 _Paul Barry_, Dec 09 2009
%E A171451 More terms from _Jinyuan Wang_, Feb 25 2020