# A119582 (b-file synthesized from sequence entry)
0 0
1 2
2 36
3 360
4 2800
5 18900
6 116424
7 672672
8 3706560
9 19691100
10 101615800
11 512143632
12 2531090016
13 12303909800
14 58971402000
15 279211536000
16 1307950928640
17 6069709778220
18 27933266453400
19 127596402318000
20 578955421044000
21 2611088948908440
22 11711414832065520
23 52265818258804800