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A088831 as a simple table

n a(n)
1 20
2 104
3 464
4 650
5 1952
6 130304
7 522752
8 8382464
9 134193152
10 549754241024
11 8796086730752
12 140737463189504
13 144115187270549504

[20,104,464,650,1952,130304,522752,8382464,
 134193152,549754241024,8796086730752,
 140737463189504,144115187270549504]

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Last modified April 1 03:22 EDT 2020. Contains 333155 sequences. (Running on oeis4.)