A020957 - cp's OEIS frontend

A020957 a(n) = Sum_{k >= 1} floor(2*tau^(n-k)).

n	a(n)
1	3
2	6
3	11
4	19
5	32
6	54
7	89
8	147
9	240
10	392
11	637
12	1035
13	1678
14	2720
15	4405
16	7133
17	11546
18	18688
19	30243
20	48941
21	79194
22	128146
23	207351
24	335509
25	542872
26	878394
27	1421279
28	2299687
29	3720980
30	6020682
31	9741677
32	15762375
33	25504068
34	41266460
35	66770545

[3, 6, 11, 19, 32, 54, 89, 147, 240, 392, 637, 1035, 1678, 2720, 4405, 7133, 11546, 18688, 30243, 48941, 79194, 128146, 207351, 335509, 542872, 878394, 1421279, 2299687, 3720980, 6020682, 9741677, 15762375, 25504068, 41266460, 66770545]

cp's OEIS Frontend

A020957 a(n) = Sum_{k >= 1} floor(2*tau^(n-k)).

Table of values

List of values