# A164575 (b-file synthesized from sequence entry)
0 0
1 0
2 4
3 12
4 56
5 240
6 1324
7 7392
8 49136
9 337920
10 2652244
11 21660672
12 196658216
13 1859020800
14 19192151164
15 206057828352
16 2385488163296
17 28669154426880
18 367966308562084
19 4893320282898432
20 68978503204900376
21 1005520890400604160
22 15445185289163949004
23 244890632417194278912