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A072755 as a simple table

n a(n)
0 1
1 4
2 17
3 140
4 2257
5 40766
6 206087
7 246853
8 452940
9 699793
10 1152733
11 8768924
12 9921657
13 18690581
14 122065143
15 262820867
16 2487452946
17 144535091735
18 147022544681
19 585602725778
20 2489433447793
21 5564469621364
22 13618372690521

[1,4,17,140,2257,40766,206087,246853,452940,
 699793,1152733,8768924,9921657,18690581,122065143,
 262820867,2487452946,144535091735,147022544681,
 585602725778,2489433447793,5564469621364,
 13618372690521]

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Last modified February 26 09:33 EST 2020. Contains 332277 sequences. (Running on oeis4.)