One half of the number of permutations of [n] such that the differences have three runs with the same signs.
5, 29, 118, 418, 1383, 4407, 13736, 42236, 128761, 390385, 1179354, 3554454
1 seqfan posts
Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java