A108485 - cp's OEIS frontend

A108485 a(n) = Sum_{k=0..floor(n/2)} binomial(2n-2k,2k)2^(n-k).

n	a(n)
0	1
1	2
2	6
3	32
4	140
5	600
6	2632
7	11520
8	50320
9	219936
10	961376
11	4201984
12	18366144
13	80275840
14	350873728
15	1533616128
16	6703206656
17	29298713088
18	128060286464
19	559732334592
20	2446506216448
21	10693312305152
22	46738866751488

[1, 2, 6, 32, 140, 600, 2632, 11520, 50320, 219936, 961376, 4201984, 18366144, 80275840, 350873728, 1533616128, 6703206656, 29298713088, 128060286464, 559732334592, 2446506216448, 10693312305152, 46738866751488]

cp's OEIS Frontend

A108485 a(n) = Sum_{k=0..floor(n/2)} binomial(2n-2k,2k)2^(n-k).

Table of values

List of values