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A105999 as a simple table

n a(n)
0 1
1 4
2 10
3 26
4 77
5 235
6 779
7 2785
8 10643
9 43697
10 192893
11 915218
12 4657929
13 25380749
14 147721169
15 916036271
16 6037442989
17 42191467826
18 311911160465
19 2434014941905
20 20007995450483
21 172911791611798
22 1568190042677867

[1,4,10,26,77,235,779,2785,10643,43697,192893,
 915218,4657929,25380749,147721169,916036271,
 6037442989,42191467826,311911160465,2434014941905,
 20007995450483,172911791611798,1568190042677867]

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Last modified January 23 13:57 EST 2022. Contains 350511 sequences. (Running on oeis4.)