# A058649 (b-file synthesized from sequence entry)
0 0
1 1
2 18
3 132
4 680
5 2880
6 10752
7 36736
8 117504
9 357120
10 1041920
11 2939904
12 8067072
13 21618688
14 56770560
15 146472960
16 372113408
17 932511744
18 2308571136
19 5653135360
20 13707509760
21 32942063616
22 78525759488
23 185799278592
24 436627046400