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A297309 as a simple table

n a(n)
1 4
2 23
3 117
4 609
5 3159
6 16389
7 85041
8 441225
9 2289339
10 11878281
11 61631001
12 319774761
13 1659164103
14 8608637997
15 44666257401
16 231752633913
17 1202457662523
18 6238998904833
19 32371291359585
20 167959719216009
21 871465613342823

[4,23,117,609,3159,16389,85041,441225,2289339,
 11878281,61631001,319774761,1659164103,8608637997,
 44666257401,231752633913,1202457662523,
 6238998904833,32371291359585,167959719216009,
 871465613342823]

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)