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A074507 as a simple table

n a(n)
0 3
1 9
2 35
3 153
4 707
5 3369
6 16355
7 80313
8 397187
9 1972809
10 9824675
11 49005273
12 244672067
13 1222297449
14 6108298595
15 30531927033
16 152630937347
17 763068593289
18 3815084686115
19 19074648589593
20 95370918425027
21 476847618556329

[3,9,35,153,707,3369,16355,80313,397187,1972809,
 9824675,49005273,244672067,1222297449,6108298595,
 30531927033,152630937347,763068593289,
 3815084686115,19074648589593,95370918425027,
 476847618556329]

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Last modified November 19 00:12 EST 2019. Contains 329310 sequences. (Running on oeis4.)