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A013320 as a simple table

n a(n)
0 1
1 0
2 1
3 6
4 21
5 120
6 1077
7 8918
8 83097
9 952560
10 11790649
11 156839430
12 2318954253
13 37207496040
14 637980683277
15 11745733936022
16 231142374081009
17 4825295491430880
18 106636356923768497
19 2489165244414184326

[1,0,1,6,21,120,1077,8918,83097,952560,11790649,
 156839430,2318954253,37207496040,637980683277,
 11745733936022,231142374081009,4825295491430880,
 106636356923768497,2489165244414184326]

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Last modified April 18 06:12 EDT 2024. Contains 371769 sequences. (Running on oeis4.)