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A000289 as a simple table

n a(n)
0 1
1 4
2 7
3 31
4 871
5 756031
6 571580604871
7 326704387862983487112031
8 106735757048926752040856495274871386126283608871
9 11392521832807516835658052968328096177131218666695418950023483907701862019030266123104859068031

[1,4,7,31,871,756031,571580604871,
 326704387862983487112031,
 106735757048926752040856495274871386126283608871,
 11392521832807516835658052968328096177131218666695\
 418950023483907701862019030266123104859068031]

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Last modified February 19 18:31 EST 2018. Contains 299356 sequences. (Running on oeis4.)