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 A374880 #6 Aug 02 2024 18:59:15
%S A374880 0,1,18,256,5400,117649,3359232,100000000,3643149312,137858491849,
%T A374880 6126151500000,281474976710656,14777503265582208,799006685782884121,
%U A374880 48413259982080000000,3011361496339065143296,206882551397716479442944,14551915228366851806640625
%N A374880 Obverse convolution (floor(3n/2))**(floor(3n/2)); see Comments.
%C A374880 See A374848 for the definition of obverse convolution and a guide to related sequences. If k>=0, then a(2k) is even and a(2k+1) is a square.
%F A374880 a(n) ~ exp(-1/3) * (3*n/2)^(n+1). - _Vaclav Kotesovec_, Aug 02 2024
%t A374880 s[n_] := Floor[3 n/2]; t[n_] := Floor[3 n/2];
%t A374880 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374880 Table[u[n], {n, 0, 24}]
%Y A374880 Cf. A016789, A374848.
%K A374880 nonn
%O A374880 0,3
%A A374880 _Clark Kimberling_, Jul 31 2024