# A119581 (b-file synthesized from sequence entry)
0 0
1 3
2 24
3 150
4 840
5 4410
6 22176
7 108108
8 514800
9 2406690
10 11085360
11 50438388
12 227149104
13 1014058500
14 4493059200
15 19777483800
16 86555576160
17 376877404530
18 1633524354000
19 7051380128100
20 30326236340400
21 129989276677260
22 555482126422080
23 2367111334185000
24 10061252349127200