# A012418 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 6
4 21
5 100
6 1005
7 9170
8 73353
9 794952
10 11042745
11 144625118
12 1936131549
13 31475441452
14 562265168101
15 9960214270890
16 187956163443857
17 3970728871687824
18 88040662078595313
19 1994667867977462454