# A307468 (b-file synthesized from sequence entry)
0 1
1 4
2 28
3 232
4 2156
5 21944
6 240280
7 2787320
8 33820044
9 424925872
10 5486681368
11 72398776344
12 972270849512
13 13247921422480
14 182729003683352
15 2546778437385032
16 35816909974343308
17 507700854900783784
18 7246857513425470288
19 104083322583897779656