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A223283 as a simple table

n a(n)
1 20
2 15
3 87
4 351
5 1575
6 6831
7 29943
8 130815
9 572103
10 2501199
11 10936215
12 47815839
13 209064807
14 914089455
15 3996657207
16 17474508351
17 76403468295
18 334057454991
19 1460593174743
20 6386124254175
21 27921931810983
22 122082540957999

[20,15,87,351,1575,6831,29943,130815,572103,
 2501199,10936215,47815839,209064807,914089455,
 3996657207,17474508351,76403468295,334057454991,
 1460593174743,6386124254175,27921931810983,
 122082540957999]

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Last modified June 6 04:28 EDT 2024. Contains 373115 sequences. (Running on oeis4.)