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A007855 as a simple table

n a(n)
1 1
2 3
3 13
4 63
5 326
6 1769
7 9964
8 57843
9 344203
10 2090470
11 12912988
12 80899801
13 512896540
14 3284651548
15 21217493460
16 138080484819
17 904454380446
18 5958186674879
19 39448465279220
20 262359379484522
21 1751912981641794
22 11741044418866476

[1,3,13,63,326,1769,9964,57843,344203,2090470,
 12912988,80899801,512896540,3284651548,
 21217493460,138080484819,904454380446,
 5958186674879,39448465279220,262359379484522,
 1751912981641794,11741044418866476]

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Last modified April 20 06:19 EDT 2019. Contains 322294 sequences. (Running on oeis4.)