# A321631 (b-file synthesized from sequence entry)
0 1
1 2
2 12
3 144
4 3096
5 108360
6 5655816
7 411319656
8 39671951112
9 4893703950888
10 750952371679560
11 140249748485473128
12 31317032510269102728
13 8238144264272296209576
14 2521295866600890750225864
15 888208511406331319697951720
16 356838916983029735020537321224
17 162168578455999889944653036525864