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A281373 as a simple table

n a(n)
0 0
1 1
2 60
3 1680
4 30280
5 405678
6 4369680
7 39729200
8 315045840
9 2230260741
10 14340456648
11 84870112272
12 467160257760
13 2411818867430
14 11759239565472
15 54457051387536
16 240692336520352
17 1019498573990610
18 4152992658207660
19 16319887656747248
20 62032458633713904
21 228608370781579488

[0,1,60,1680,30280,405678,4369680,39729200,
 315045840,2230260741,14340456648,84870112272,
 467160257760,2411818867430,11759239565472,
 54457051387536,240692336520352,1019498573990610,
 4152992658207660,16319887656747248,
 62032458633713904,228608370781579488]

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Last modified March 4 23:52 EST 2021. Contains 341812 sequences. (Running on oeis4.)