# A052791 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 6
4 72
5 540
6 3240
7 17010
8 81648
9 367416
10 1574640
11 6495390
12 25981560
13 101328084
14 386889048
15 1450833930
16 5356925280
17 19514513520
18 70252248672
19 250273635894
20 883318714920
21 3091615502220
22 10739295955080
23 37050571045026
24 127030529297232
25 433058622604200
26 1468633589701200