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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.
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%I #2 May 01 2014 02:47:11

%S 0,1,2,6,15,40,109,302,846,2390,6796,19426,55767,160668,464305,

%T 1345282,3906701,11367696,33135987,96740610,282831981,827939880,

%U 2426431239,7118546874,20904025380,61439768166,180725813478,532004277518

%N 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 [seq(ChessPawnTriangle(j,1),j=1..40)];

%Y The left column of table A062104. Cf. also A062107.

%K nonn

%O 1,3

%A _Antti Karttunen_, May 30 2001