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A155015 as a simple table

n a(n)
0 0
1 1
2 45
3 420
4 2048
5 6987
6 19047
7 44467
8 92681
9 177147
10 316227
11 534145
12 861979
13 1338715
14 2012353
15 2941046
16 4194304
17 5854220
18 8016758
19 10793065
20 14310835
21 18715701
22 24172676
23 30867616
24 39008731
25 48828125
26 60583368
27 74559107

[0,1,45,420,2048,6987,19047,44467,92681,177147,
 316227,534145,861979,1338715,2012353,2941046,
 4194304,5854220,8016758,10793065,14310835,
 18715701,24172676,30867616,39008731,48828125,
 60583368,74559107]

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Last modified October 25 14:34 EDT 2021. Contains 348255 sequences. (Running on oeis4.)