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A268972 as a simple table

n a(n)
1 9
2 60
3 240
4 912
5 3312
6 11664
7 40176
8 136080
9 454896
10 1504656
11 4933872
12 16061328
13 51963120
14 167226768
15 535692528
16 1709114256
17 5433452784
18 17218688400
19 54411055344
20 171498136464
21 539289320688
22 1692252695952
23 5299912289520

[9,60,240,912,3312,11664,40176,136080,454896,
 1504656,4933872,16061328,51963120,167226768,
 535692528,1709114256,5433452784,17218688400,
 54411055344,171498136464,539289320688,
 1692252695952,5299912289520]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)