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A253879 as a simple table

n a(n)
1 1
2 9
3 136
4 2160
5 34417
6 548505
7 8741656
8 139317984
9 2220346081
10 35386219305
11 563959162792
12 8987960385360
13 143243407002961
14 2282906551662009
15 36383261419589176
16 579849276161764800
17 9241205157168647617
18 147279433238536597065
19 2347229726659416905416

[1,9,136,2160,34417,548505,8741656,139317984,
 2220346081,35386219305,563959162792,8987960385360,
 143243407002961,2282906551662009,
 36383261419589176,579849276161764800,
 9241205157168647617,147279433238536597065,
 2347229726659416905416]

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Last modified March 5 16:55 EST 2021. Contains 341827 sequences. (Running on oeis4.)