# A149369 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 45
5 171
6 687
7 2803
8 11748
9 49831
10 214434
11 931716
12 4085156
13 18040522
14 80183435
15 358314337
16 1608920279
17 7254733913
18 32835218026
19 149109378700
20 679164584418
21 3101883535311
22 14201896280766
23 65169414956550
24 299665789841870
25 1380552538613722
26 6371296684194483
27 29451369951867444