# A154961 (b-file synthesized from sequence entry)
1 0
2 1
3 3
4 25
5 340
6 7026
7 204862
8 8007602
9 404077632
10 25569505628
11 1982619985192
12 184861494417920
13 20406183592852460
14 2631875641089358912
15 392163247878318070876
16 66855512799464487146588
17 12929525365915201064027856
18 2815456378791384288128303192