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A305554 as a simple table

n a(n)
0 0
1 1
2 4
3 22
4 116
5 600
6 3072
7 15634
8 79256
9 400718
10 2022160
11 10189974
12 51292608
13 257965512
14 1296483996
15 6512176890
16 32694946020
17 164082802440
18 823188507360
19 4128668625430
20 20701989426800
21 103781348220380
22 520167491584660
23 2606714240022090
24 13061050758478620
25 65434115386531850

[0,1,4,22,116,600,3072,15634,79256,400718,2022160,
 10189974,51292608,257965512,1296483996,6512176890,
 32694946020,164082802440,823188507360,
 4128668625430,20701989426800,103781348220380,
 520167491584660,2606714240022090,
 13061050758478620,65434115386531850]

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Last modified September 26 17:00 EDT 2021. Contains 347670 sequences. (Running on oeis4.)