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A223763 as a simple table

n a(n)
1 2
2 12
3 71
4 361
5 1748
6 8007
7 35513
8 153450
9 651075
10 2723829
11 11275932
12 46302339
13 188958191
14 767474182
15 3105857015

[2,12,71,361,1748,8007,35513,153450,651075,
 2723829,11275932,46302339,188958191,767474182,
 3105857015]

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Last modified March 29 15:16 EDT 2020. Contains 333107 sequences. (Running on oeis4.)