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A081557 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 11
5 31
6 107
7 379
8 1556
9 6556
10 31007
11 150349
12 801341
13 4373461
14 25853102
15 156297964
16 1012382291
17 6698486371
18 47089993967
19 337789490599
20 2557480572656
21 19738202807236
22 159928950077327
23 1319703681935929
24 11382338060040761
25 99896787342523081

[1,1,2,4,11,31,107,379,1556,6556,31007,150349,
 801341,4373461,25853102,156297964,1012382291,
 6698486371,47089993967,337789490599,2557480572656,
 19738202807236,159928950077327,1319703681935929,
 11382338060040761,99896787342523081]

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Last modified October 16 06:34 EDT 2019. Contains 328051 sequences. (Running on oeis4.)