# A148988 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 33
5 114
6 439
7 1689
8 6816
9 27624
10 114988
11 482122
12 2052197
13 8800591
14 38111226
15 166113251
16 729043557
17 3217041687
18 14269984543
19 63581058548
20 284464187518
21 1277397712864
22 5755627288014
23 26013095364631
24 117900835435171
25 535755079557245
26 2440363785685090
27 11140458053301700
28 50961594352233542