# A215223 (b-file synthesized from sequence entry)
1 4
2 12
3 24
4 72
5 120
6 408
7 840
8 2448
9 5760
10 15960
11 39864
12 108024
13 275184
14 728784
15 1895760
16 4998528
17 13033560
18 34250904
19 89602632
20 235157640
21 615871032