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A064671 as a simple table

n a(n)
1 0
2 3
3 18
4 91
5 420
6 1829
7 7686
8 31623
9 128520
10 518665
11 2084874
12 8361995
13 33497100
14 134094861
15 536608782
16 2146926607
17 8588754960
18 34357248017
19 137433710610
20 549744803859
21 2199000186900
22 8796044787733
23 35184271425558
24 140737278640151
25 562949517213720

[0,3,18,91,420,1829,7686,31623,128520,518665,
 2084874,8361995,33497100,134094861,536608782,
 2146926607,8588754960,34357248017,137433710610,
 549744803859,2199000186900,8796044787733,
 35184271425558,140737278640151,562949517213720]

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Last modified February 22 01:34 EST 2019. Contains 320381 sequences. (Running on oeis4.)