A123965 - cp's OEIS frontend

A123965 Triangle read by rows: T(0,0)=1; T(n,k) is the coefficient of x^k in the polynomial (-1)^n*p(n,x), where p(n,x) is the characteristic polynomial of the n X n tridiagonal matrix with 3's on the main diagonal and -1's on the super- and subdiagonal (n >= 1; 0 <= k <= n).

n	a(n)
0	1
1	3
2	-1
3	8
4	-6
5	1
6	21
7	-25
8	9
9	-1
10	55
11	-90
12	51
13	-12
14	1
15	144
16	-300
17	234
18	-86
19	15
20	-1
21	377
22	-954
23	951
24	-480
25	130
26	-18
27	1
28	987
29	-2939
30	3573
31	-2305
32	855
33	-183
34	21
35	-1
36	2584
37	-8850
38	12707
39	-10008
40	4740
41	-1386
42	245
43	-24
44	1
45	6765
46	-26195
47	43398
48	-40426
49	23373
50	-8715
51	2100
52	-316
53	27
54	-1

[1, 3, -1, 8, -6, 1, 21, -25, 9, -1, 55, -90, 51, -12, 1, 144, -300, 234, -86, 15, -1, 377, -954, 951, -480, 130, -18, 1, 987, -2939, 3573, -2305, 855, -183, 21, -1, 2584, -8850, 12707, -10008, 4740, -1386, 245, -24, 1, 6765, -26195, 43398, -40426, 23373, -8715, 2100, -316, 27, -1]

cp's OEIS Frontend

A123965 Triangle read by rows: T(0,0)=1; T(n,k) is the coefficient of x^k in the polynomial (-1)^n*p(n,x), where p(n,x) is the characteristic polynomial of the n X n tridiagonal matrix with 3's on the main diagonal and -1's on the super- and subdiagonal (n >= 1; 0 <= k <= n).

Table of values

List of values