# A088674 (b-file synthesized from sequence entry)
0 1
1 3
2 6
3 45
4 126
5 750
6 2796
7 19389
8 75894
9 449562
10 2027796
11 12211794
12 57895596
13 332787324
14 1677545304
15 9766642077
16 50378641830
17 286825948194
18 1529968671492
19 8729259097158
20 47374697101572
21 269062276076868
22 1484430536591592