A117265 - cp's OEIS frontend

A117265 Triangle T, read by rows, where matrix power T^-2 has -2^(n+1) in the secondary diagonal: [T^-2](n+1,n) = -2^(n+1), with all 1's in the main diagonal and zeros elsewhere.

n	a(n)
0	1
1	1
2	1
3	3
4	2
5	1
6	20
7	12
8	4
9	1
10	280
11	160
12	48
13	8
14	1
15	8064
16	4480
17	1280
18	192
19	16
20	1
21	473088
22	258048
23	71680
24	10240
25	768
26	32
27	1
28	56229888
29	30277632
30	8257536
31	1146880
32	81920
33	3072
34	64
35	1
36	13495173120
37	7197425664
38	1937768448
39	264241152
40	18350080
41	655360

[1, 1, 1, 3, 2, 1, 20, 12, 4, 1, 280, 160, 48, 8, 1, 8064, 4480, 1280, 192, 16, 1, 473088, 258048, 71680, 10240, 768, 32, 1, 56229888, 30277632, 8257536, 1146880, 81920, 3072, 64, 1, 13495173120, 7197425664, 1937768448, 264241152, 18350080, 655360]

cp's OEIS Frontend

A117265 Triangle T, read by rows, where matrix power T^-2 has -2^(n+1) in the secondary diagonal: [T^-2](n+1,n) = -2^(n+1), with all 1's in the main diagonal and zeros elsewhere.

Table of values

List of values