# A381307 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 4
4 25
5 126
6 841
7 8303
8 84561
9 925480
10 12285121
11 181409427
12 2840445169
13 49113986936
14 932675641353
15 18883732449871
16 408771283327969
17 9499097097870720
18 234457146543484225
19 6115077874320445715
20 168654204908597822241
21 4902220448616467300248