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A221600 as a simple table

n a(n)
1 1
2 19
3 140
4 1206
5 10020
6 84160
7 705156
8 5912277
9 49563492
10 415515336
11 3483440165
12 29203220338
13 244823382148
14 2052461910954
15 17206688780344
16 144251223226490
17 1209321306131007
18 10138271200549217
19 84993576475914931
20 712538449541938001

[1,19,140,1206,10020,84160,705156,5912277,
 49563492,415515336,3483440165,29203220338,
 244823382148,2052461910954,17206688780344,
 144251223226490,1209321306131007,
 10138271200549217,84993576475914931,
 712538449541938001]

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Last modified February 8 06:34 EST 2023. Contains 360134 sequences. (Running on oeis4.)