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 A144547 #8 Jul 14 2025 14:30:21
%S A144547 1,2880,758041804800,13319336815141167562752000,
%T A144547 15354978274323252140217954794120612413440000,
%U A144547 1160183823755957350394353874696058298158177597536388268425216000000,5744950321305805807513301436668994962443746225944514592041927656983526026246267317780480000000,1864342934383580231084517260259192252139946430124547822192277172067265954040486594733297802503864086641393952539593932800000000
%N A144547 A bisection of A028666.
%F A144547 From _Amiram Eldar_, Jul 14 2025: (Start)
%F A144547 a(n) = A028666(2*n).
%F A144547 a(n) ~ c * 16^(2*n^2+n), where c = A100221. (End)
%t A144547 a[n_] := 16^n * Product[16^n - 4^k, {k, 0, 2*n-1}]; Array[a, 8, 0] (* _Amiram Eldar_, Jul 14 2025 *)
%o A144547 (PARI) a(n) = 16^n * prod(k = 0, 2*n-1, 16^n - 4^k); \\ _Amiram Eldar_, Jul 14 2025
%Y A144547 Cf. A028666, A100221, A144546.
%K A144547 nonn
%O A144547 0,2
%A A144547 _N. J. A. Sloane_, Dec 30 2008