A300760 - cp's OEIS frontend

A300760 Number of ways to select 4 numbers from the set of the first n natural numbers avoiding 3-term arithmetic progressions.

n	a(n)
4	0
5	1
6	4
7	10
8	25
9	51
10	98
11	165
12	267
13	407
14	601
15	849
16	1175
17	1580
18	2089
19	2703
20	3452
21	4338
22	5395
23	6622
24	8058
25	9706
26	11606
27	13758
28	16210
29	18963
30	22066
31	25520
32	29379
33	33645
34	38376
35	43571
36	49293
37	55545
38	62391
39	69831
40	77937
41	86710
42	96223
43	106477
44	117550
45	129444
46	142241

[0, 1, 4, 10, 25, 51, 98, 165, 267, 407, 601, 849, 1175, 1580, 2089, 2703, 3452, 4338, 5395, 6622, 8058, 9706, 11606, 13758, 16210, 18963, 22066, 25520, 29379, 33645, 38376, 43571, 49293, 55545, 62391, 69831, 77937, 86710, 96223, 106477, 117550, 129444, 142241]

cp's OEIS Frontend

A300760 Number of ways to select 4 numbers from the set of the first n natural numbers avoiding 3-term arithmetic progressions.

Table of values

List of values