A127358 - cp's OEIS frontend

A127358 a(n) = Sum_{k=0..n} binomial(n, floor(k/2))*2^(n-k).

n	a(n)
0	1
1	3
2	8
3	21
4	54
5	138
6	350
7	885
8	2230
9	5610
10	14088
11	35346
12	88596
13	221952
14	555738
15	1391061
16	3480870
17	8708610
18	21783680
19	54483510
20	136254964
21	340729788
22	852000828
23	2130354786
24	5326563004
25	13317759588
26	33296999120
27	83247698100
28	208129274400
29	520343244300

[1, 3, 8, 21, 54, 138, 350, 885, 2230, 5610, 14088, 35346, 88596, 221952, 555738, 1391061, 3480870, 8708610, 21783680, 54483510, 136254964, 340729788, 852000828, 2130354786, 5326563004, 13317759588, 33296999120, 83247698100, 208129274400, 520343244300]

cp's OEIS Frontend

A127358 a(n) = Sum_{k=0..n} binomial(n, floor(k/2))*2^(n-k).

Table of values

List of values