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A221088 as a simple table

n a(n)
1 0
2 4
3 24
4 169
5 1155
6 7921
7 54288
8 372100
9 2550408
10 17480761
11 119814915
12 821223649
13 5628750624
14 38580030724
15 264431464440
16 1812440220361
17 12422650078083
18 85146110326225
19 583600122205488
20 4000054745112196
21 27416783093579880

[0,4,24,169,1155,7921,54288,372100,2550408,
 17480761,119814915,821223649,5628750624,
 38580030724,264431464440,1812440220361,
 12422650078083,85146110326225,583600122205488,
 4000054745112196,27416783093579880]

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Last modified September 30 21:59 EDT 2023. Contains 365812 sequences. (Running on oeis4.)