# A107510 (b-file synthesized from sequence entry)
0 1
1 420
2 33210
3 1045940
4 18236130
5 208282068
6 1727719290
7 11158908420
8 58971933570
9 264526505540
10 1035559318266
11 3615105424020
12 11446772554210
13 33324462972660
14 90187696858170
15 228961922378596
16 549375765196290
17 1253706017102820
18 2735578083949370