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 A049619 #8 Aug 05 2021 20:01:36
%S A049619 0,0,0,3,4,11,14,26,30,49,56,82,92,126,138,184,200,256,276,343,366,
%T A049619 449,478,574,608,720,758,889,934,1081,1134,1298,1352,1540,1602,1814,
%U A049619 1888,2120,2196,2456,2544,2826,2924,3229,3330,3669,3782,4146,4268,4661,4792
%N A049619 a(n) = Sum_{i=0..floor((n+1)/2)} T(2i+1,n-2i-1) where T is A049615.
%K A049619 nonn
%O A049619 0,4
%A A049619 _Clark Kimberling_
%E A049619 More terms from _Sean A. Irvine_, Aug 05 2021