# A135410 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 10
5 26
6 80
7 272
8 1076
9 4848
10 24832
11 142340
12 902440
13 6257264
14 47042924
15 380800060
16 3300070116
17 30472353884
18 298595442140