A174346 - cp's OEIS frontend

A174346 Triangle T(n, k) = (binomial(n-1, k-1)binomial(n, k-1)/k) ( 3^(k-1) if floor(n/2) >= k, otherwise 3^(n-k) ), read by rows.

n	a(n)
1	1
2	1
3	1
4	1
5	9
6	1
7	1
8	18
9	18
10	1
11	1
12	30
13	180
14	30
15	1
16	1
17	45
18	450
19	450
20	45
21	1
22	1
23	63
24	945
25	4725
26	945
27	63
28	1
29	1
30	84
31	1764
32	13230
33	13230
34	1764
35	84
36	1
37	1
38	108
39	3024
40	31752
41	142884
42	31752
43	3024
44	108
45	1
46	1
47	135
48	4860
49	68040
50	428652
51	428652
52	68040
53	4860
54	135
55	1

[1, 1, 1, 1, 9, 1, 1, 18, 18, 1, 1, 30, 180, 30, 1, 1, 45, 450, 450, 45, 1, 1, 63, 945, 4725, 945, 63, 1, 1, 84, 1764, 13230, 13230, 1764, 84, 1, 1, 108, 3024, 31752, 142884, 31752, 3024, 108, 1, 1, 135, 4860, 68040, 428652, 428652, 68040, 4860, 135, 1]

cp's OEIS Frontend

A174346 Triangle T(n, k) = (binomial(n-1, k-1)binomial(n, k-1)/k) ( 3^(k-1) if floor(n/2) >= k, otherwise 3^(n-k) ), read by rows.

Table of values

List of values

cp's OEIS Frontend

A174346 Triangle T(n, k) = (binomial(n-1, k-1)*binomial(n, k-1)/k) * ( 3^(k-1) if floor(n/2) >= k, otherwise 3^(n-k) ), read by rows.

Table of values

List of values

A174346 Triangle T(n, k) = (binomial(n-1, k-1)binomial(n, k-1)/k) ( 3^(k-1) if floor(n/2) >= k, otherwise 3^(n-k) ), read by rows.