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 A379555 #7 Dec 26 2024 10:16:17 %S A379555 1,1,10,312,19800,2112320,339721200,76736721600,23161613673856, %T A379555 9002333397657600,4378779743334796800,2605462349704907264000, %U A379555 1861650500340096385920000,1572904258939213777572323328,1551130967414603865237595648000,1765646154517023983944233381888000,2297658475440816396798100972400640000 %N A379555 Row products of the triangle A330613. %F A379555 a(n) = (1 - 2*n)^(n-1)*(1 - 2*n + 2*n^2)*Pochhammer(-2*(n - 1)^2/(2*n - 1), n - 1). %F A379555 a(n) ~ C*2^n*exp(3/(8*n)-n)*n^(2*n), where C = sqrt(2/e) = A227514. %t A379555 a[n_]:=(1-2n)^(n-1)(1-2n+2n^2)Pochhammer[-2(n-1)^2/(2n-1),n-1]; Array[a,17,0] %Y A379555 Cf. A227514, A330613. %K A379555 nonn %O A379555 0,3 %A A379555 _Stefano Spezia_, Dec 25 2024