A104721 - cp's OEIS frontend

A104721 Expansion of (1+x)^2/(1-4*x^2).

n	a(n)
0	1
1	2
2	5
3	8
4	20
5	32
6	80
7	128
8	320
9	512
10	1280
11	2048
12	5120
13	8192
14	20480
15	32768
16	81920
17	131072
18	327680
19	524288
20	1310720
21	2097152
22	5242880
23	8388608
24	20971520
25	33554432
26	83886080
27	134217728
28	335544320
29	536870912
30	1342177280
31	2147483648

[1, 2, 5, 8, 20, 32, 80, 128, 320, 512, 1280, 2048, 5120, 8192, 20480, 32768, 81920, 131072, 327680, 524288, 1310720, 2097152, 5242880, 8388608, 20971520, 33554432, 83886080, 134217728, 335544320, 536870912, 1342177280, 2147483648]

cp's OEIS Frontend

A104721 Expansion of (1+x)^2/(1-4*x^2).

Table of values

List of values