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A027080 as a simple table

n a(n)
2 2
3 15
4 100
5 757
6 5902
7 46907
8 377520
9 3065809
10 25078650
11 206416795
12 1708129244
13 14202265321
14 118585167502
15 993915161547
16 8358970631568
17 70518298143329
18 596590060985546
19 5060232622624651
20 43022268222676124
21 366575545244139845
22 3129747701356459022
23 26771150349554898415

[2,15,100,757,5902,46907,377520,3065809,25078650,
 206416795,1708129244,14202265321,118585167502,
 993915161547,8358970631568,70518298143329,
 596590060985546,5060232622624651,
 43022268222676124,366575545244139845,
 3129747701356459022,26771150349554898415]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)