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A222631 as a simple table

n a(n)
1 4
2 10
3 34
4 161
5 707
6 3309
7 16892
8 89384
9 465258
10 2414240
11 12658133
12 66882546
13 353898321
14 1874207359
15 9950624881
16 52968141606
17 282452336722
18 1508213363988
19 8064519904852
20 43179574656064
21 231467793567740
22 1242085617391923

[4,10,34,161,707,3309,16892,89384,465258,2414240,
 12658133,66882546,353898321,1874207359,9950624881,
 52968141606,282452336722,1508213363988,
 8064519904852,43179574656064,231467793567740,
 1242085617391923]

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Last modified September 10 01:04 EDT 2024. Contains 375769 sequences. (Running on oeis4.)