# A123348 (b-file synthesized from sequence entry)
0 0
1 3
2 12
3 54
4 240
5 1068
6 4752
7 21144
8 94080
9 418608
10 1862592
11 8287584
12 36875520
13 164077248
14 730060032
15 3248394624
16 14453698560
17 64311583488
18 286153731072
19 1273238091264
20 5665259827200
21 25207515491328
22 112160581619712
23 499057357461504
24 2220550593085440
25 9880317087264768
26 43962369535229952