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 A387139 #4 Aug 18 2025 18:49:09 %S A387139 1,2,8,48,192,1920,23040,322560,1290240,7741440,154828800,3406233600, %T A387139 40874803200,1062744883200,29756856729600,892705701888000, %U A387139 3570822807552000,121407975456768000,1456895705481216000,55362036808286208000,1107240736165724160000 %N A387139 Row sums of A387138. %p A387139 seq(add(binomial(n, k) * mul(NumberTheory:-Radical(j), j = 1..n), k = 0..n), n = 0..20); %Y A387139 Cf. A387138. %K A387139 nonn %O A387139 0,2 %A A387139 _Peter Luschny_, Aug 18 2025