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 A144546 #8 Jul 14 2025 14:30:25
%S A144546 12,11612160,794088208701849600,3575164027575627746190393606144000,
%T A144546 1055182047088717407398960909148529544369642384916480000,
%U A144546 20410164807073092317242309800149338693366138889849970301267088483593224192000000,25872955740757748502626229629361173659982454517929458713719920139287952355803151825297413315474342543360000000
%N A144546 A bisection of A028666.
%F A144546 From _Amiram Eldar_, Jul 14 2025: (Start)
%F A144546 a(n) = A028666(2*n+1).
%F A144546 a(n) ~ c * 16^(2*n^2+3*n+1), where c = A100221. (End)
%t A144546 a[n_] := 4^(2*n+1) * Product[4^(2*n+1) - 4^k, {k, 0, 2*n}]; Array[a, 7, 0] (* _Amiram Eldar_, Jul 14 2025 *)
%o A144546 (PARI) a(n) = 4^(2*n+1) * prod(k = 0, 2*n, 4^(2*n+1) - 4^k); \\ _Amiram Eldar_, Jul 14 2025
%Y A144546 Cf. A028666, A100221, A144547.
%K A144546 nonn
%O A144546 0,1
%A A144546 _N. J. A. Sloane_, Dec 30 2008
%E A144546 a(0) = 1 removed by _Amiram Eldar_, Jul 14 2025