A020962 - cp's OEIS frontend

A020962 a(n) = Sum_{k >= 1} floor((1+sqrt(2))^(n-k)).

n	a(n)
1	1
2	3
3	8
4	22
5	55
6	137
7	334
8	812
9	1965
10	4751
11	11476
12	27714
13	66915
14	161557
15	390042
16	941656
17	2273369
18	5488411
19	13250208
20	31988846
21	77227919
22	186444705
23	450117350
24	1086679428
25	2623476229
26	6333631911
27	15290740076

[1, 3, 8, 22, 55, 137, 334, 812, 1965, 4751, 11476, 27714, 66915, 161557, 390042, 941656, 2273369, 5488411, 13250208, 31988846, 77227919, 186444705, 450117350, 1086679428, 2623476229, 6333631911, 15290740076]

cp's OEIS Frontend

A020962 a(n) = Sum_{k >= 1} floor((1+sqrt(2))^(n-k)).

Table of values

List of values