a(n) is the minimal number of additions needed to grow to radius n, in the two-dimensional abelian sandpile growth model with h=2.
2, 6, 10, 22, 26, 50, 66, 78, 122, 142, 154, 194, 254, 270, 342, 386, 418, 490, 518
2 seqfan posts
Sun Nov 7 19:08:37 CET 2010 [seqfan] Re: physics