Array read by antidiagonals: for n-th row (n>=0), T(n,0) = 1; for k > 0, T(n,k) = T(n,k-1)-(n+k-1) if this is positive and has not already appeared in this row, otherwise T(n,k) = T(n,k-1)+(n+k-1).
1, 1, 1, 1, 2, 2, 1, 3, 4, 4, 1, 4, 6, 7, 7, 1, 5, 8, 2, 3, 3, 1, 6, 10, 3, 7, 8, 8, 1, 7, 12, 4, 9
2 seqfan posts
Fri Mar 12 22:23:40 CET 2010 [seqfan] Re: seqs whose |differences| are 1,2,3,4,...