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A178684 as a simple table

n a(n)
1 0
2 0
3 1
4 5
5 18
6 53
7 138
8 332
9 757
10 1661
11 3546
12 7424
13 15328
14 31336
15 63618
16 128531
17 258811
18 519956
19 1042992
20 2090009
21 4185231
22 8377158
23 16762853
24 33536516
25 67086633
26 134190278
27 268401718
28 536829625
29 1073691505
30 2147422558

[0,0,1,5,18,53,138,332,757,1661,3546,7424,15328,
 31336,63618,128531,258811,519956,1042992,2090009,
 4185231,8377158,16762853,33536516,67086633,
 134190278,268401718,536829625,1073691505,
 2147422558]

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Last modified February 3 20:37 EST 2023. Contains 360044 sequences. (Running on oeis4.)