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A201231 as a simple table

n a(n)
1 3
2 24
3 140
4 1028
5 7791
6 66027
7 508368
8 4293464
9 33177954
10 282310785
11 2226471492
12 18845872240
13 149352193586
14 1252800269866
15 9919439949887
16 82782378005253
17 656171911832714
18 5446960364973500
19 43213785216715427
20 357463895275500826

[3,24,140,1028,7791,66027,508368,4293464,33177954,
 282310785,2226471492,18845872240,149352193586,
 1252800269866,9919439949887,82782378005253,
 656171911832714,5446960364973500,
 43213785216715427,357463895275500826]

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Last modified June 10 10:32 EDT 2024. Contains 373264 sequences. (Running on oeis4.)