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A060897 as a simple table

n a(n)
0 1
1 4
2 12
3 44
4 144
5 528
6 1808
7 6676
8 23536
9 87568
10 315136
11 1180680
12 4314560
13 16263896
14 60138816
15 227899484
16 850600944
17 3238194560
18 12177384544
19 46542879384
20 176110444736
21 675431779856
22 2568878867200
23 9882068082112

[1,4,12,44,144,528,1808,6676,23536,87568,315136,
 1180680,4314560,16263896,60138816,227899484,
 850600944,3238194560,12177384544,46542879384,
 176110444736,675431779856,2568878867200,
 9882068082112]

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Last modified December 7 18:12 EST 2019. Contains 329847 sequences. (Running on oeis4.)