# A175671 (b-file synthesized from sequence entry)
0 1
1 6
2 20
3 567
4 3240
5 155925
6 8292375
7 147349125
8 312615903600
9 103180488035625
10 769328200265625
11 316985199315159375
12 8682638068197843750
13 165206922515800790625
14 527010082825404522093750
15 39040543480476432234965625
16 33712429605969723121012500000
17 1968441947987203748028891796875