# A037767 (b-file synthesized from sequence entry)
1 3
2 18
3 110
4 661
5 3969
6 23814
7 142886
8 857317
9 5143905
10 30863430
11 185180582
12 1111083493
13 6666500961
14 39999005766
15 239994034598
16 1439964207589
17 8639785245537
18 51838711473222
19 311032268839334
20 1866193613036005