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A001921 as a simple table

n a(n)
0 0
1 7
2 104
3 1455
4 20272
5 282359
6 3932760
7 54776287
8 762935264
9 10626317415
10 148005508552
11 2061450802319
12 28712305723920
13 399910829332567
14 5570039304932024
15 77580639439715775
16 1080558912851088832
17 15050244140475527879
18 209622859053806301480

[0,7,104,1455,20272,282359,3932760,54776287,
 762935264,10626317415,148005508552,2061450802319,
 28712305723920,399910829332567,5570039304932024,
 77580639439715775,1080558912851088832,
 15050244140475527879,209622859053806301480]

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Last modified April 19 21:43 EDT 2021. Contains 343117 sequences. (Running on oeis4.)