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 A227664 #3 Jul 19 2013 18:53:05 %S A227664 1,1,1024,345104904,3738507768500896,515791104488454210243072, %T A227664 533787802709908480895773030991840, %U A227664 2939698583689917131062885788617101100432640,67615349092818211761363011993295568195043095341810560,5423343272088334681448905520570069990718596808928384073877898816 %N A227664 Number of lattice paths from {10}^n to {0}^n using steps that decrement one component by 1 such that for each point (p_1,p_2,...,p_n) we have abs(p_{i}-p_{i+1}) <= 1. %e A227664 a(2) = 2^10 = 1024. %Y A227664 Row n=10 of A227655. %Y A227664 Cf. A000079. %K A227664 nonn %O A227664 0,3 %A A227664 _Alois P. Heinz_, Jul 19 2013