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 A292609 #5 Sep 26 2017 09:47:05 %S A292609 1,1,18,1348,264168,107059696,77812181280,92178659860288, %T A292609 166177428088123008,432941319641569590016,1565619431839802755158528, %U A292609 7608371278068863387781342208,48386147164823804551330131929088 %N A292609 Alternating rows sums of A292605. %p A292609 a := proc(n) A292605_row(n); add((-1)^k*%[k+1], k=0..n) end: seq(a(n), n=0..12); %Y A292609 Cf. A292605. %K A292609 nonn %O A292609 0,3 %A A292609 _Peter Luschny_, Sep 26 2017