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A013420 as a simple table

n a(n)
0 1
1 0
2 0
3 40
4 0
5 108000
6 1232000
7 1647734400
8 57657600000
9 85927162048000
10 6053574009600000
11 11452742596189440000
12 1349295190949488640000
13 3261229190521061760000000
14 577775664177165642240000000

[1,0,0,40,0,108000,1232000,1647734400,57657600000,
 85927162048000,6053574009600000,
 11452742596189440000,1349295190949488640000,
 3261229190521061760000000,
 577775664177165642240000000]

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Last modified May 29 15:18 EDT 2024. Contains 372952 sequences. (Running on oeis4.)