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 A262553 #11 Oct 09 2015 17:02:29 %S A262553 1,1,0,1,1,0,1,1,1,0,1,1,2,1,0,1,1,2,3,1,0,1,1,2,4,4,1,0,1,1,2,4,6,5, %T A262553 1,0,1,1,2,4,6,9,6,1,0,1,1,2,4,6,10,12,7,1,0,1,1,2,4,6,10,14,16,8,1,0, %U A262553 1,1,2,4,6,10,14,20,20,9,1,0,1,1,2,4,6,10,14,20,26,25,10,1,0 %N A262553 Square array read by antidiagonals: number of ways of making change when coins have values 1,2,4,8,16,... %H A262553 Alois P. Heinz, <a href="/A262553/b262553.txt">Antidiagonals n = 0..140, flattened</a> %H A262553 G. Blom and C.-E. Froeberg, <a href="/A002575/a002575.pdf">Om myntvaexling (On money-changing) [Swedish]</a>, Nordisk Matematisk Tidskrift, 10 (1962), 55-69, 103. [Annotated scanned copy] %e A262553 Rows 0,1,2,3,... are: %e A262553 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,... %e A262553 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,... %e A262553 1,1,2,3,4,5,6,7,8,9,10,11,12,13,... %e A262553 1,1,2,4,6,9,12,16,20,25,30,36,... %e A262553 1,1,2,4,6,10,14,20,26,35,44,56,... %e A262553 1,1,2,4,6,10,14,20,26,36,46,60,... %e A262553 ... %Y A262553 See A181322 for another version of this array. %Y A262553 Row 3 is A002620. %K A262553 nonn,tabl %O A262553 0,13 %A A262553 _N. J. A. Sloane_, Oct 09 2015