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 A049706 #8 Aug 07 2021 01:12:34 %S A049706 1,1,3,5,8,11,15,20,25,30,37,44,52,61,68,76,88,99,111,124,134,145,161, %T A049706 176,190,206,221,236,256,274,293,316,334,352,372,390,414,441,462,482, %U A049706 510,536,563,594,616,639,673,704,733,764,790,818,856,891,920,952,982 %N A049706 a(n) = T(n,n+2), array T as in A049704. %K A049706 nonn %O A049706 0,3 %A A049706 _Clark Kimberling_ %E A049706 More terms from _Sean A. Irvine_, Aug 06 2021