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A222667 as a simple table

n a(n)
1 0
2 0
3 2
4 9
5 24
6 80
7 288
8 1038
9 3608
10 12696
11 45024
12 160364
13 571200
14 2039424
15 7297632
16 26163672
17 93938304
18 337754400
19 1215965472
20 4382841504
21 15814326912
22 57117508992
23 206479723776
24 747042295968
25 2704860854400
26 9800596459776

[0,0,2,9,24,80,288,1038,3608,12696,45024,160364,
 571200,2039424,7297632,26163672,93938304,
 337754400,1215965472,4382841504,15814326912,
 57117508992,206479723776,747042295968,
 2704860854400,9800596459776]

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Last modified May 25 10:05 EDT 2022. Contains 354066 sequences. (Running on oeis4.)