# A048892 (b-file synthesized from sequence entry)
1 1
2 1
3 4
4 9
5 45
6 76
7 270
8 2204
9 3718
10 95499
11 590890
12 16023339
13 16475964
14 1745175039
15 31287652672
16 347321438520
17 2620400333120
18 239919791836864