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A195499 as a simple table

n a(n)
1 3
2 8
3 33
4 120
5 451
6 1680
7 6273
8 23408
9 87363
10 326040
11 1216801
12 4541160
13 16947843
14 63250208
15 236052993
16 880961760
17 3287794051
18 12270214440
19 45793063713
20 170902040408
21 637815097923
22 2380358351280
23 8883618307201
24 33154114877520

[3,8,33,120,451,1680,6273,23408,87363,326040,
 1216801,4541160,16947843,63250208,236052993,
 880961760,3287794051,12270214440,45793063713,
 170902040408,637815097923,2380358351280,
 8883618307201,33154114877520]

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Last modified November 20 13:19 EST 2019. Contains 329336 sequences. (Running on oeis4.)