# A053817 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 33
4 148
5 765
6 4626
7 32431
8 259512
9 2335689
10 23356990
11 256927011
12 3083124276
13 40080615757
14 561128620794
15 8416929312135
16 134670868994416
17 2289404772905361
18 41209285912296822
19 782976432333639979
20 15659528646672799980
21 328850101580128800021