# A149874 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 13
4 42
5 138
6 491
7 1734
8 6612
9 24870
10 97583
11 380218
12 1541360
13 6179237
14 25482059
15 104303570
16 437439838
17 1819760781
18 7724694109
19 32573638812
20 139701430732
21 595473172306
22 2576042993462
23 11082594563917
24 48289942147271
25 209383081359099
26 918120665994465
27 4007798506498828
28 17669572450129852