A141591 - cp's OEIS frontend

A141591 Triangle, read by rows, T(n, k) = 2*A123125(n-1, k), for n >= 2, otherwise T(n, 0) = T(n, n) = -1, with T(0, 0) = T(1, 0) = 1.

n	a(n)
0	1
1	1
2	-1
3	-1
4	2
5	-1
6	-1
7	2
8	2
9	-1
10	-1
11	2
12	8
13	2
14	-1
15	-1
16	2
17	22
18	22
19	2
20	-1
21	-1
22	2
23	52
24	132
25	52
26	2
27	-1
28	-1
29	2
30	114
31	604
32	604
33	114
34	2
35	-1
36	-1
37	2
38	240
39	2382
40	4832
41	2382
42	240
43	2
44	-1
45	-1
46	2
47	494
48	8586
49	31238
50	31238
51	8586
52	494
53	2
54	-1
55	-1
56	2
57	1004
58	29216
59	176468
60	312380
61	176468
62	29216
63	1004
64	2
65	-1
66	-1
67	2
68	2026
69	95680
70	910384
71	2620708
72	2620708
73	910384
74	95680
75	2026
76	2
77	-1

[1, 1, -1, -1, 2, -1, -1, 2, 2, -1, -1, 2, 8, 2, -1, -1, 2, 22, 22, 2, -1, -1, 2, 52, 132, 52, 2, -1, -1, 2, 114, 604, 604, 114, 2, -1, -1, 2, 240, 2382, 4832, 2382, 240, 2, -1, -1, 2, 494, 8586, 31238, 31238, 8586, 494, 2, -1, -1, 2, 1004, 29216, 176468, 312380, 176468, 29216, 1004, 2, -1, -1, 2, 2026, 95680, 910384, 2620708, 2620708, 910384, 95680, 2026, 2, -1]

cp's OEIS Frontend

A141591 Triangle, read by rows, T(n, k) = 2*A123125(n-1, k), for n >= 2, otherwise T(n, 0) = T(n, n) = -1, with T(0, 0) = T(1, 0) = 1.

Table of values

List of values