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A180226 as a simple table

n a(n)
1 0
2 1
3 4
4 26
5 144
6 836
7 4784
8 27496
9 157824
10 906256
11 5203264
12 29875616
13 171535104
14 984896576
15 5654937344
16 32468715136
17 186424233984
18 1070384087296
19 6145778689024
20 35286955629056
21 202605609406464
22 1163291993916416
23 6679224069730304
24 38349816218085376

[0,1,4,26,144,836,4784,27496,157824,906256,
 5203264,29875616,171535104,984896576,5654937344,
 32468715136,186424233984,1070384087296,
 6145778689024,35286955629056,202605609406464,
 1163291993916416,6679224069730304,
 38349816218085376]

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Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)