# A050183 (b-file synthesized from sequence entry)
0 0
1 1
2 4
3 15
4 55
5 200
6 728
7 2652
8 9690
9 35530
10 130750
11 482885
12 1789515
13 6653325
14 24812400
15 92798375
16 347993910
17 1308233790
18 4929576600
19 18615637950
20 70441574000
21 267058714626
22 1014283603024
23 3858687620200
24 14702930414900