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A131935 as a simple table

n a(n)
1 4
2 7
3 15
4 31
5 65
6 136
7 285
8 597
9 1251
10 2621
11 5492
12 11507
13 24111
14 50519
15 105853 

[4,7,15,31,65,136,285,597,1251,2621,5492,11507,
 24111,50519,105853]

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Last modified April 24 08:59 EDT 2024. Contains 371935 sequences. (Running on oeis4.)