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A247721 as a simple table

n a(n)
1 168
2 456
3 1248
4 3424
5 9392
6 25822
7 71060
8 195536
9 537880
10 1480026
11 4073228
12 11209522
13 30845400
14 84880220
15 233584180
16 642804172
17 1768901108
18 4867756146
19 13395492168
20 36862857286
21 101441854028
22 279154735896
23 768198993968

[168,456,1248,3424,9392,25822,71060,195536,537880,
 1480026,4073228,11209522,30845400,84880220,
 233584180,642804172,1768901108,4867756146,
 13395492168,36862857286,101441854028,279154735896,
 768198993968]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)