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A006930 as a simple table

n a(n)
0 1
1 2
2 5
3 14
4 42
5 131
6 420
7 1376
8 4589
9 15537
10 53293
11 184881
12 647752
13 2289215
14 8152147
15 29226618
16 105408688
17 382193502
18 1392377762
19 5094356032
20 18711122069
21 68965586862
22 255006331944
23 945662753514
24 3516281928159
25 13106923073426
26 48967229534156
27 183326438562982

[1,2,5,14,42,131,420,1376,4589,15537,53293,184881,
 647752,2289215,8152147,29226618,105408688,
 382193502,1392377762,5094356032,18711122069,
 68965586862,255006331944,945662753514,
 3516281928159,13106923073426,48967229534156,
 183326438562982]

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Last modified December 7 17:16 EST 2016. Contains 278890 sequences.