# A148581 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 6
4 20
5 52
6 180
7 531
8 1935
9 6087
10 23075
11 76002
12 294690
13 1007573
14 3967709
15 13952603
16 55705977
17 200096396
18 808097516
19 2954315100
20 12036963816
21 44673868259
22 183352067367
23 689141233096
24 2846666932970
25 10814730959009
26 44922309300087
27 172272809441244
28 719005305749812
29 2780261740311903