# A098305 (b-file synthesized from sequence entry)
0 0
1 1
2 5
3 36
4 245
5 1681
6 11520
7 78961
8 541205
9 3709476
10 25425125
11 174266401
12 1194439680
13 8186811361
14 56113239845
15 384605867556
16 2636127833045
17 18068288963761
18 123841894913280
19 848824975429201
20 5817932933091125
21 39876705556208676
22 273319005960369605
23 1873356336166378561