# A077834 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 19
4 56
5 168
6 505
7 1514
8 4542
9 13627
10 40880
11 122640
12 367921
13 1103762
14 3311286
15 9933859
16 29801576
17 89404728
18 268214185
19 804642554
20 2413927662
21 7241782987
22 21725348960
23 65176046880
24 195528140641
25 586584421922
26 1759753265766
27 5279259797299
28 15837779391896