# A090578 (b-file synthesized from sequence entry)
0 1
1 4
2 10
3 30
4 74
5 222
6 546
7 1628
8 3978
9 11810
10 28658
11 84520
12 203562
13 596520
14 1425924
15 4150232
16 9838116
17 28418002
18 66805554