# A056952 (b-file synthesized from sequence entry)
0 0
1 1
2 1
3 2
4 4
5 8
6 20
7 44
8 124
9 300
10 920
11 2420
12 7940
13 22460
14 78040
15 235260
16 859580
17 2741660
18 10477880
19 35152820
20 139931620
21 491459820
22 2030707640
23 7436765660
24 31805257340
25 121046445260
26 534514790680
27 2108118579060
28 9591325648580