A087481 - cp's OEIS frontend

A087481 Number of polynomials of the form x^n +- x^(n-1) +- x^(n-2) +- ... +- 1 irreducible over the integers.

n	a(n)
1	2
2	4
3	4
4	16
5	12
6	48
7	64
8	192
9	260
10	1024
11	1128
12	4096
13	4480
14	13310
15	20620
16	65434
17	76376
18	262144
19	358532
20	932134
21	1391720
22	4194090
23	5447256
24	16570740
25	23153832
26	61696126
27	97361128

[2, 4, 4, 16, 12, 48, 64, 192, 260, 1024, 1128, 4096, 4480, 13310, 20620, 65434, 76376, 262144, 358532, 932134, 1391720, 4194090, 5447256, 16570740, 23153832, 61696126, 97361128]

cp's OEIS Frontend

A087481 Number of polynomials of the form x^n +- x^(n-1) +- x^(n-2) +- ... +- 1 irreducible over the integers.

Table of values

List of values