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A027216 as a simple table

n a(n)
1 1
2 4
3 15
4 63
5 237
6 1034
7 3945
8 17577
9 67640
10 304902
11 1179415
12 5352038
13 20771331
14 94628132
15 368083879
16 1680820301
17 6548692260
18 29946087674
19 116816782997
20 534628747310

[1,4,15,63,237,1034,3945,17577,67640,304902,
 1179415,5352038,20771331,94628132,368083879,
 1680820301,6548692260,29946087674,116816782997,
 534628747310]

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Last modified December 8 22:51 EST 2016. Contains 278957 sequences.