Enumeration of permutations of {1, ..., n} with n = 15 by values of L_n,
the length of the longest increasing subsequence. There is 1 permutation
with L_n = 1, 9694844 with L_n = 2, etc.
1:1
2:9694844
3:8017098273
4:164161815768
5:485534447114
6:434119587475
7:172912977525
8:37558353900
9:4927007100
10:410474625
11:22128576
12:766221
13:16381
14:196
15:1