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A253571 as a simple table

n a(n)
1 1
2 2
3 15
4 144
5 1765
6 26400
7 466459
8 9508352
9 219651849
10 5671088640
11 161833149511
12 5058050224128
13 171837337744813
14 6304955850432512
15 248477268083174355
16 10467916801317273600
17 469451601966727952401
18 22329535184262444220416
19 1122809130124800181976575

[1,2,15,144,1765,26400,466459,9508352,219651849,
 5671088640,161833149511,5058050224128,
 171837337744813,6304955850432512,
 248477268083174355,10467916801317273600,
 469451601966727952401,22329535184262444220416,
 1122809130124800181976575]

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Last modified February 21 02:57 EST 2019. Contains 320364 sequences. (Running on oeis4.)