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A002639 as a simple table

n a(n)
0 0
1 1
2 1
3 21
4 31
5 6257
6 10293
7 279025
8 483127
9 435506703
10 776957575
11 22417045555
12 40784671953
13 9569130097211
14 17652604545791
15 523910972020563
16 976501268709949
17 935823746406530603
18 1758220447807291611

[0,1,1,21,31,6257,10293,279025,483127,435506703,
 776957575,22417045555,40784671953,9569130097211,
 17652604545791,523910972020563,976501268709949,
 935823746406530603,1758220447807291611]

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Last modified May 24 19:33 EDT 2013. Contains 225630 sequences.