# A221176 (b-file synthesized from sequence entry)
0 1
1 16
2 272
3 4880
4 91920
5 1810192
6 37142288
7 791744272
8 17490370320
9 399558315792
10 9421351690000
11 228916588400400
12 5723078052339472
13 147025755978698512
14 3876566243300318992
15 104789417805394595600
16 2901159958960121863952
17 82188946843192555474704
18 2380551266738846355103504
19 70441182699006212824911632