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A007689 as a simple table

n a(n)
0 2
1 5
2 13
3 35
4 97
5 275
6 793
7 2315
8 6817
9 20195
10 60073
11 179195
12 535537
13 1602515
14 4799353
15 14381675
16 43112257
17 129271235
18 387682633
19 1162785755
20 3487832977
21 10462450355
22 31385253913
23 94151567435
24 282446313697
25 847322163875

[2,5,13,35,97,275,793,2315,6817,20195,60073,
 179195,535537,1602515,4799353,14381675,43112257,
 129271235,387682633,1162785755,3487832977,
 10462450355,31385253913,94151567435,282446313697,
 847322163875]

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Last modified May 27 06:24 EDT 2019. Contains 323599 sequences. (Running on oeis4.)