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A236886 as a simple table

n a(n)
1 81
2 245
3 781
4 2605
5 8901
6 31253
7 111685
8 406949
9 1503365
10 5632837
11 21327109
12 81569413
13 314366469
14 1220142341
15 4761187333
16 18668554757
17 73468028933
18 290057876485
19 1147984105477
20 4553121130501
21 18087737270277
22 71955008016389

[81,245,781,2605,8901,31253,111685,406949,1503365,
 5632837,21327109,81569413,314366469,1220142341,
 4761187333,18668554757,73468028933,290057876485,
 1147984105477,4553121130501,18087737270277,
 71955008016389]

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Last modified July 3 06:54 EDT 2022. Contains 355031 sequences. (Running on oeis4.)