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A100328 as a simple table

n a(n)
0 1
1 4
2 20
3 116
4 736
5 4952
6 34716
7 250868
8 1855520
9 13979192
10 106901032
11 827644424
12 6474611984
13 51100656544
14 406400018092
15 3253636464756
16 26201323746880
17 212093247874904
18 1724793778005528
19 14084738953391768
20 115447965121881856

[1,4,20,116,736,4952,34716,250868,1855520,
 13979192,106901032,827644424,6474611984,
 51100656544,406400018092,3253636464756,
 26201323746880,212093247874904,1724793778005528,
 14084738953391768,115447965121881856]

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Last modified September 27 08:39 EDT 2021. Contains 347689 sequences. (Running on oeis4.)