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A277176 as a simple table

n a(n)
0 1
1 2
2 6
3 23
4 106
5 572
6 3564
7 25377
8 204446
9 1844876
10 18465556
11 203179902
12 2438366836
13 31699511768
14 443795839192
15 6656947282725
16 106511191881270
17 1810690391626380
18 32592427526913540
19 619256124778620450
20 12385122502136529420
21 260087572569333384840

[1,2,6,23,106,572,3564,25377,204446,1844876,
 18465556,203179902,2438366836,31699511768,
 443795839192,6656947282725,106511191881270,
 1810690391626380,32592427526913540,
 619256124778620450,12385122502136529420,
 260087572569333384840]

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Last modified March 19 15:02 EDT 2019. Contains 321330 sequences. (Running on oeis4.)