# A247663 (b-file synthesized from sequence entry)
0 1
1 16
2 68
3 256
4 777
5 2160
6 5460
7 13056
8 29482
9 63952
10 133456
11 270080
12 531091
13 1019424
14 1913156
15 3520512
16 6360765
17 11305488
18 19789160
19 34159616
20 58201535