# A164583 (b-file synthesized from sequence entry)
0 1
1 36
2 400
3 3136
4 20736
5 123904
6 692224
7 3686400
8 18939904
9 94633984
10 462422016
11 2218786816
12 10485760000
13 48922361856
14 225754218496
15 1031865892864
16 4677219385344
17 21045339750400
18 94076963651584
19 418089296461824