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 A328924 #3 Oct 31 2019 07:59:29
%S A328924 1,0,1,2,0,1,12,12,6,2,300,336,168,48,6,13680,15120,7560,2160,360,24,
%T A328924 920400,1000800,498960,146880,27000,2880,120,85004640,91314720,
%U A328924 45516240,13698720,2691360,342720,25200,720,10314511200,10981474560,5476625280,1675699200,344433600,48545280,4515840,241920,5040
%N A328924 Triangle T(n,k) read by rows: connected topologies of the effective potential in Goldstone diagrams with n interactions and k external potentials.
%H A328924 P. J. Rossky, M. Karplus, <a href="https://doi.org/10.1063/1.432387">The enumeration of Goldstone diagrams in many-body perturbation theory</a>, J. Chem. Phys. 64 (1976) 1569, Teff(n,k)
%F A328924 T(n,k) = sum_{t=k..n} (-1)^(k+t) *2^(t-k) *binomial(t,k) *A328923(n,t).
%e A328924 1;
%e A328924 0 1;
%e A328924 2 0 1;
%e A328924 12 12 6 2;
%e A328924 300 336 168 48 6;
%e A328924 13680 15120 7560 2160 360 24;
%e A328924 920400 1000800 498960 146880 27000 2880 120;
%e A328924 85004640 91314720 45516240 13698720 2691360 342720 25200 720;
%Y A328924 Cf. A328921-A328923.
%K A328924 nonn,tabl
%O A328924 0,4
%A A328924 _R. J. Mathar_, Oct 31 2019