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A083564 as a simple table

n a(n)
1 3
2 21
3 72
4 329
5 1353
6 5796
7 24447
8 103729
9 439128
10 1860621
11 7880997
12 33385604
13 141421803
14 599075421
15 2537719272
16 10749959329
17 45537545553
18 192900159396
19 817138154247
20 3461452823129
21 14662949371128
22 62113250430021

[3,21,72,329,1353,5796,24447,103729,439128,
 1860621,7880997,33385604,141421803,599075421,
 2537719272,10749959329,45537545553,192900159396,
 817138154247,3461452823129,14662949371128,
 62113250430021]

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Last modified July 29 07:28 EDT 2021. Contains 346340 sequences. (Running on oeis4.)