# A007225 (b-file synthesized from sequence entry)
5 2
6 12
7 52
8 232
9 952
10 3888
11 15504
12 61333
13 240350
14 937508
15 3641820
16 14112560
17 54587280
18 210907168
19 814278240
20 3142611402
21 12126758436
22 46796872472
23 180619420520
24 697320058864
25 2693097842512
26 10405151052320
27 40219629005920