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 A062106 #2 May 01 2014 02:47:11 %S A062106 0,1,2,6,15,40,109,302,846,2390,6796,19426,55767,160668,464305, %T A062106 1345282,3906701,11367696,33135987,96740610,282831981,827939880, %U A062106 2426431239,7118546874,20904025380,61439768166,180725813478,532004277518 %N A062106 Number of ways a black pawn (from any starting square on the second back rank) can (theoretically) end on the n-th square of the leftmost file counted from the back rank. %p A062106 [seq(ChessPawnTriangle(j,1),j=1..40)]; %Y A062106 The left column of table A062104. Cf. also A062107. %K A062106 nonn %O A062106 1,3 %A A062106 _Antti Karttunen_, May 30 2001