# A174318 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 9
5 45
6 265
7 1855
8 14833
9 133497
10 1334961
11 14684571
12 176214841
13 2290792933
14 32071101049
15 481066515735
16 7697064251745
17 130850092279665
18 2355301661033953
19 44750731559645107
20 895014631192902121
21 18795307255050944541
22 413496759611120779881