# A277132 (b-file synthesized from sequence entry)
1 1
2 3
3 14
4 78
5 508
6 3796
7 32048
8 301872
9 3139680
10 35746080
11 442258560
12 5909028480
13 84802072320
14 1301090515200
15 21253339699200
16 368281038182400
17 6747621163315200
18 130338926671564800
19 2647326900234240000
20 56404832240977920000