# A149840 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 12
4 36
5 105
6 359
7 1234
8 4179
9 15184
10 55991
11 204578
12 771394
13 2964054
14 11327531
15 43884270
16 172977384
17 680790080
18 2693644347
19 10800095655
20 43381674853
21 174545003823
22 708672027933
23 2888280123869
24 11778061217176
25 48301653756423
26 198967324198300
27 820165234102410
28 3391901879073496