A328611 - cp's OEIS frontend

A328611 Irregular triangular array read by rows: row n gives the coefficients of the second of two factors of even-degree polynomials described in Comments.

n	a(n)
1	0
2	-1
3	1
4	4
5	-1
6	3
7	3
8	6
9	-1
10	4
11	12
12	6
13	8
14	-1
15	7
16	20
17	30
18	10
19	10
20	-1
21	11
22	42
23	60
24	60
25	15
26	12
27	-1
28	18
29	77
30	147
31	140
32	105
33	21
34	14
35	-1
36	29
37	144
38	308
39	392
40	280
41	168
42	28
43	16
44	-1
45	47
46	261
47	648
48	924
49	882
50	504
51	252
52	36
53	18
54	-1
55	76
56	470
57	1305
58	2160
59	2310
60	1764
61	840

[0, -1, 1, 4, -1, 3, 3, 6, -1, 4, 12, 6, 8, -1, 7, 20, 30, 10, 10, -1, 11, 42, 60, 60, 15, 12, -1, 18, 77, 147, 140, 105, 21, 14, -1, 29, 144, 308, 392, 280, 168, 28, 16, -1, 47, 261, 648, 924, 882, 504, 252, 36, 18, -1, 76, 470, 1305, 2160, 2310, 1764, 840]

cp's OEIS Frontend

A328611 Irregular triangular array read by rows: row n gives the coefficients of the second of two factors of even-degree polynomials described in Comments.

Table of values

List of values