A344912 - cp's OEIS frontend

A344912 Irregular triangle read by rows, Trow(n) = Seq_{k=0..n/3} Seq_{j=0..n-3k} (n! binomial(n - 3k, j)) / (k!(n - 3k)!3^k).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	3
9	1
10	2
11	1
12	4
13	6
14	4
15	1
16	8
17	8
18	1
19	5
20	10
21	10
22	5
23	1
24	20
25	40
26	20
27	1
28	6
29	15
30	20
31	15
32	6
33	1
34	40
35	120
36	120
37	40
38	40
39	1
40	7
41	21
42	35
43	35
44	21
45	7
46	1
47	70
48	280
49	420
50	280
51	70
52	280
53	280
54	1
55	8
56	28
57	56
58	70
59	56
60	28
61	8
62	1
63	112
64	560
65	1120
66	1120
67	560
68	112
69	1120
70	2240
71	1120

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 2, 1, 4, 6, 4, 1, 8, 8, 1, 5, 10, 10, 5, 1, 20, 40, 20, 1, 6, 15, 20, 15, 6, 1, 40, 120, 120, 40, 40, 1, 7, 21, 35, 35, 21, 7, 1, 70, 280, 420, 280, 70, 280, 280, 1, 8, 28, 56, 70, 56, 28, 8, 1, 112, 560, 1120, 1120, 560, 112, 1120, 2240, 1120]

cp's OEIS Frontend

A344912 Irregular triangle read by rows, Trow(n) = Seq_{k=0..n/3} Seq_{j=0..n-3k} (n! binomial(n - 3k, j)) / (k!(n - 3k)!3^k).

Table of values

List of values

cp's OEIS Frontend

A344912 Irregular triangle read by rows, Trow(n) = Seq_{k=0..n/3} Seq_{j=0..n-3*k} (n! * binomial(n - 3*k, j)) / (k!*(n - 3*k)!*3^k).

Table of values

List of values

A344912 Irregular triangle read by rows, Trow(n) = Seq_{k=0..n/3} Seq_{j=0..n-3k} (n! binomial(n - 3k, j)) / (k!(n - 3k)!3^k).