# A306290 (b-file synthesized from sequence entry)
0 1
1 20
2 252
3 2860
4 30940
5 325584
6 3364900
7 34337160
8 347103900
9 3483301360
10 34754081648
11 345120260940
12 3413758188932
13 33655718658800
14 330869721936600
15 3244839440755920
16 31754250910172700
17 310165459118369712
18 3024542552887591120
19 29449493278116018800
20 286360607519186119920