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A290147 as a simple table

n a(n)
0 1
1 3
2 12
3 66
4 408
5 2712
6 18912
7 136488
8 1010784
9 7637664
10 58650240
11 456377664
12 3590674176
13 28516332288
14 228297907200
15 1840515987072
16 14929020470784
17 121749590032896
18 997676696045568
19 8210704762960896
20 67835018440593408
21 562407734010335232
22 4677727530446635008

[1,3,12,66,408,2712,18912,136488,1010784,7637664,
 58650240,456377664,3590674176,28516332288,
 228297907200,1840515987072,14929020470784,
 121749590032896,997676696045568,8210704762960896,
 67835018440593408,562407734010335232,
 4677727530446635008]

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Last modified April 20 00:58 EDT 2024. Contains 371798 sequences. (Running on oeis4.)