# A318913 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 2
4 9
5 44
6 385
7 1854
8 18193
9 153656
10 1924641
11 17123930
12 276117721
13 2880135972
14 51150361249
15 738748900694
16 11608748988705
17 198747251005424
18 4029150617813953
19 67937635488741426
20 1607525018948543401
21 32739373317847964060
22 757174325538283357761
23 16444280000832495199982