One half of the number of permutations of [n] such that the differences have 4 runs with the same signs.
16, 150, 926, 4788, 22548, 100530, 433162, 1825296, 7577120, 31130190
1 seqfan posts
Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java