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A323261 as a simple table

n a(n)
0 0
1 1
2 3
3 12
4 48
5 195
6 791
7 3211
8 13031
9 52884
10 214614
11 870949
12 3534489
13 14343685
14 58209627
15 236226664
16 958656488
17 3890425619
18 15788149015
19 64071562799
20 260015607607
21 1055196927408
22 4282206617710
23 17378077058869
24 70523818494625
25 286200191092217
26 1161459364079427
27 4713441487441732
28 19128117041912800

[0,1,3,12,48,195,791,3211,13031,52884,214614,
 870949,3534489,14343685,58209627,236226664,
 958656488,3890425619,15788149015,64071562799,
 260015607607,1055196927408,4282206617710,
 17378077058869,70523818494625,286200191092217,
 1161459364079427,4713441487441732,
 19128117041912800]

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Last modified July 23 14:36 EDT 2019. Contains 325255 sequences. (Running on oeis4.)