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A191899 as a simple table

n a(n)
0 0
1 128
2 3280
3 32768
4 195312
5 839808
6 2882400
7 8388608
8 21523360
9 50000000
10 107179440
11 214990848
12 407865360
13 737894528
14 1281445312
15 2147483648
16 3487878720
17 5509980288
18 8491781520
19 12800000000
20 18911429680
21 27437936768
22 39155492640
23 55037657088
24 76293945312
25 104413532288

[0,128,3280,32768,195312,839808,2882400,8388608,
 21523360,50000000,107179440,214990848,407865360,
 737894528,1281445312,2147483648,3487878720,
 5509980288,8491781520,12800000000,18911429680,
 27437936768,39155492640,55037657088,76293945312,
 104413532288]

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Last modified June 15 20:50 EDT 2019. Contains 324145 sequences. (Running on oeis4.)