# A244559 (b-file synthesized from sequence entry)
1 1
2 4
3 36
4 416
5 140
6 4940
7 250160
8 160940
9 936464640
10 9364646400
11 981811366400
12 1649810013600
13 3644490406400
14 6449149644811400
15 1904936491693664000
16 408144496481646464000
17 925253664491646408136000
18 36160494994902549464000
19 141361625100160646494000