# A077840 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 16
4 50
5 163
6 524
7 1687
8 5435
9 17503
10 56372
11 181558
12 584741
13 1883272
14 6065441
15 19534921
16 62915981
17 202633048
18 652618802
19 2101884691
20 6769524932
21 21802560343
22 70219349555
23 226154954935
24 728375639564
25 2345874192598
26 7555340168693
27 24333429833872