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A207428 as a simple table

n a(n)
1 9
2 81
3 351
4 1521
5 8463
6 47089
7 241087
8 1234321
9 6520459
10 34445161
11 179832029
12 938870881
13 4924284469
14 25827382681
15 135217499129
16 707921987161
17 3708936179293
18 19431812871409
19 101777874172609
20 533081279633809 

[9,81,351,1521,8463,47089,241087,1234321,6520459,
 34445161,179832029,938870881,4924284469,
 25827382681,135217499129,707921987161,
 3708936179293,19431812871409,101777874172609,
 533081279633809]

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Last modified May 14 19:46 EDT 2024. Contains 372533 sequences. (Running on oeis4.)