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A192890 as a simple table

n a(n)
0 1
1 2
2 4
3 16
4 40
5 136
6 400
7 1256
8 4272
9 14984
10 51856
11 174304
12 563776
13 1820672
14 5780864
15 18518912
16 61112832
17 213235904
18 775157504
19 2859529984
20 10441532416
21 37338042528
22 130397329216
23 447932053120
24 1524595536512
25 5194654080416
26 17800611666496

[1,2,4,16,40,136,400,1256,4272,14984,51856,174304,
 563776,1820672,5780864,18518912,61112832,
 213235904,775157504,2859529984,10441532416,
 37338042528,130397329216,447932053120,
 1524595536512,5194654080416,17800611666496]

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Last modified October 16 23:07 EDT 2021. Contains 348047 sequences. (Running on oeis4.)