A137405 - cp's OEIS frontend

A137405 Triangular sequence from coefficients of characteristic polynomial of n X n prime element matrices: M=A.B.A^(-1); (A(3) is singular): examples; A(4)= {{2, 3, 5, 7, 11}, {3, 5, 7, 11, 13}, {5, 7, 11, 13, 17}, {7, 11, 13, 17, 19}, {11, 13, 17, 19, 23}} B(4)= {{3, 5, 7, 11, 13}, {5, 7, 11, 13, 17}, {7, 11, 13, 17, 19}, {11, 13, 17, 19, 23}, {13, 17, 19, 23, 29}}.

n	a(n)
1	1
2	3
3	-1
4	-4
5	-10
6	1
7	12
8	44
9	23
10	-1
11	0
12	576
13	-864
14	-288
15	316
16	71
17	-1
18	-7104
19	-608
20	5800
21	1168
22	-670
23	-108
24	1
25	45248
26	44096
27	-19712
28	-21712
29	116
30	1768
31	151
32	-1
33	450432
34	135424
35	-346176
36	-66560
37	69008
38	7344
39	-3204
40	-204
41	1
42	2240512
43	-5071104
44	-1422080
45	2168128
46	188672
47	-212928
48	-10924
49	5960
50	265
51	-1

[1, 3, -1, -4, -10, 1, 12, 44, 23, -1, 0, 576, -864, -288, 316, 71, -1, -7104, -608, 5800, 1168, -670, -108, 1, 45248, 44096, -19712, -21712, 116, 1768, 151, -1, 450432, 135424, -346176, -66560, 69008, 7344, -3204, -204, 1, 2240512, -5071104, -1422080, 2168128, 188672, -212928, -10924, 5960, 265, -1]

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