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 A281430 #4 May 21 2017 07:48:22
%S A281430 1,4,104,6880,855680,171673600,50628300800,20616410214400,
%T A281430 11081874771968000,7600553402810368000,6477130108444835840000,
%U A281430 6713789344917138964480000,8317650472128427128258560000,12137529532422860667092992000000
%N A281430 E.g.f.: C(x)^4 where C(x) is described by A281428.
%e A281430 C(x)^4 = 1 + 4*x^2/2! + 104*x^4/4! + 6880*x^6/6! + 855680*x^8/8! + 171673600*x^10/10! + 50628300800*x^12/12! + 20616410214400*x^14/14! + 11081874771968000*x^16/16! + 7600553402810368000*x^18/18! + 6477130108444835840000*x^20/20! + 6713789344917138964480000*x^22/22! + 8317650472128427128258560000*x^24/24! +...
%o A281430 (PARI) {a(n) = my(S=x, C=1); for(i=0, n, S = intformal( C^5 +x*O(x^(2*n))); C = 1 + intformal( S*C^4 ) ); (2*n)!*polcoeff(C^4, 2*n)}
%o A281430 for(n=0, 30, print1(a(n), ", "))
%Y A281430 Cf. A281428.
%K A281430 nonn
%O A281430 0,2
%A A281430 _Paul D. Hanna_, Feb 01 2017