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A090648 as a simple table

n a(n)
0 0
1 1
2 1
3 3
4 17
5 31
6 3
7 5461
8 257
9 657
10 6355
11 60787
12 12291
13 22369621
14 617093
15 149943
16 16843009
17 5726623061
18 71613
19 91625968981
20 162529435
21 4870483401
22 50991843607
23 499069107643
24 12129927891
25 34118178995231
26 5664905191661
27 45148868444817
28 165649641466501

[0,1,1,3,17,31,3,5461,257,657,6355,60787,12291,
 22369621,617093,149943,16843009,5726623061,71613,
 91625968981,162529435,4870483401,50991843607,
 499069107643,12129927891,34118178995231,
 5664905191661,45148868444817,165649641466501]

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Last modified October 25 01:40 EDT 2021. Contains 348233 sequences. (Running on oeis4.)