# A244491 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 20
4 201
5 2604
6 40915
7 754368
8 15960945
9 381141008
10 10139372451
11 297356237760
12 9530800099513
13 331453265976000
14 12430323314648499
15 500046099516905984
16 21478615942550889825
17 981110493372418629888
18 47489191763845877910595