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 A085870 #9 May 24 2024 15:51:57 %S A085870 1,3,3,7,4,7,15,7,10,15,31,14,14,22,31,63,29,21,32,46,63,125,60,35,46, %T A085870 68,94,125,249,123,64,67,100,140,188,249,497,248,124,102,146,208,282, %U A085870 374,497,993,497,247,166,213,308,422,562,746,993,1985,994,495,290,315,454,630,844,1120,1490,1985 %N A085870 Array defined by T(i,1)=2^i-1, T(1,j)=2^j-1, T(i,j)=T(i-1,j)+T(i-1,j-1) read by antidiagonals. %Y A085870 Cf. A027649 (main diagonal). %K A085870 nonn,tabl %O A085870 1,2 %A A085870 _Benoit Cloitre_, Aug 12 2003