A063780 - cp's OEIS frontend

A063780 a(n) is the number of pairs of integer quadruples (b_1, b_2, b_3, b_4) and (c_1, c_2, c_3, c_4) satisfying 1 <= b_1 < b_2 < b_3 < b_4 < n, 1 <= c_1 < c_2 < c_3 < c_4 < n, b_i != c_j for all i,j = 1,2,3,4 and Product_{i=1..4} cos(2Pib_i/n) = Product_{i=1..4} cos(2Pic_i/n).

n	a(n)
8	0
9	1
10	3
11	4
12	9
13	9
14	18
15	17
16	93
17	29
18	84
19	45
20	433
21	66
22	253
23	93
24	1274
25	126
26	534
27	166
28	2940
29	214
30	1120
31	270
32	5866
33	335
34	1601
35	410
36	11359
37	495
38	2448
39	591
40	17371
41	699
42	3654
43	819
44	27487
45	954
46	4947
47	1099
48	42980
49	1260
50	6660
51	1436
52	59356
53	1628
54	8832
55	1836
56	82224
57	2061

[0, 1, 3, 4, 9, 9, 18, 17, 93, 29, 84, 45, 433, 66, 253, 93, 1274, 126, 534, 166, 2940, 214, 1120, 270, 5866, 335, 1601, 410, 11359, 495, 2448, 591, 17371, 699, 3654, 819, 27487, 954, 4947, 1099, 42980, 1260, 6660, 1436, 59356, 1628, 8832, 1836, 82224, 2061]

cp's OEIS Frontend

A063780 a(n) is the number of pairs of integer quadruples (b_1, b_2, b_3, b_4) and (c_1, c_2, c_3, c_4) satisfying 1 <= b_1 < b_2 < b_3 < b_4 < n, 1 <= c_1 < c_2 < c_3 < c_4 < n, b_i != c_j for all i,j = 1,2,3,4 and Product_{i=1..4} cos(2Pib_i/n) = Product_{i=1..4} cos(2Pic_i/n).

Table of values

List of values

cp's OEIS Frontend

A063780 a(n) is the number of pairs of integer quadruples (b_1, b_2, b_3, b_4) and (c_1, c_2, c_3, c_4) satisfying 1 <= b_1 < b_2 < b_3 < b_4 < n, 1 <= c_1 < c_2 < c_3 < c_4 < n, b_i != c_j for all i,j = 1,2,3,4 and Product_{i=1..4} cos(2*Pi*b_i/n) = Product_{i=1..4} cos(2*Pi*c_i/n).

Table of values

List of values

A063780 a(n) is the number of pairs of integer quadruples (b_1, b_2, b_3, b_4) and (c_1, c_2, c_3, c_4) satisfying 1 <= b_1 < b_2 < b_3 < b_4 < n, 1 <= c_1 < c_2 < c_3 < c_4 < n, b_i != c_j for all i,j = 1,2,3,4 and Product_{i=1..4} cos(2Pib_i/n) = Product_{i=1..4} cos(2Pic_i/n).