# A274657 (b-file synthesized from sequence entry)
0 1
1 1
2 9
3 75
4 3675
5 59535
6 2401245
7 57972915
8 13043905875
9 418854310875
10 30241281245175
11 1212400457192925
12 213786613951685775
13 10278202593831046875
14 1070401384414690453125
15 60013837619516978071875
16 57673297952355815927071875
17 3694483615889146090857721875