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A303843 as a simple table

n a(n)
1 0
2 0
3 1
4 4
5 15
6 51
7 175
8 573
9 1866
10 5978
11 19000
12 59859
13 187503
14 584012
15 1811212
16 5595239
17 17228943
18 52898764
19 162013452
20 495100454
21 1510029296
22 4597430832
23 13975327501
24 42422033217
25 128606150706
26 389423872694
27 1177925775148
28 3559477190797
29 10746362772325

[0,0,1,4,15,51,175,573,1866,5978,19000,59859,
 187503,584012,1811212,5595239,17228943,52898764,
 162013452,495100454,1510029296,4597430832,
 13975327501,42422033217,128606150706,389423872694,
 1177925775148,3559477190797,10746362772325]

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Last modified May 16 19:46 EDT 2021. Contains 343951 sequences. (Running on oeis4.)