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A007578 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 10
5 26
6 76
7 232
8 763
9 2611
10 9415
11 35135
12 136335
13 544623
14 2242618
15 9463508
16 40917803
17 180620411
18 813405580
19 3728248990
20 17377551032
21 82232982872
22 394742985974
23 1919885633178
24 9453682648281
25 47086636037601
26 237071351741426
27 1205689994416252

[1,1,2,4,10,26,76,232,763,2611,9415,35135,136335,
 544623,2242618,9463508,40917803,180620411,
 813405580,3728248990,17377551032,82232982872,
 394742985974,1919885633178,9453682648281,
 47086636037601,237071351741426,1205689994416252]

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Last modified February 19 10:20 EST 2018. Contains 299330 sequences. (Running on oeis4.)