A129384 - cp's OEIS frontend

A129384 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k, floor((n-k)/2)).

n	a(n)
0	1
1	1
2	3
3	5
4	11
5	19
6	39
7	71
8	141
9	261
10	513
11	965
12	1889
13	3585
14	7017
15	13417
16	26287
17	50527
18	99147
19	191399
20	376155
21	728619
22	1434051
23	2785667
24	5489823
25	10689199
26	21089799
27	41146383
28	81262983
29	158818311
30	313935831
31	614469591
32	1215549981

[1, 1, 3, 5, 11, 19, 39, 71, 141, 261, 513, 965, 1889, 3585, 7017, 13417, 26287, 50527, 99147, 191399, 376155, 728619, 1434051, 2785667, 5489823, 10689199, 21089799, 41146383, 81262983, 158818311, 313935831, 614469591, 1215549981]

cp's OEIS Frontend

A129384 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k, floor((n-k)/2)).

Table of values

List of values