A285268 - cp's OEIS frontend

A285268 Triangle read by rows: T(m,n) = Sum_{i=1..n} P(m,i) where P(m,n) = m!/(m-n)! is the number of permutations of m items taken n at a time, for 1 <= n <= m.

n	a(n)
1	1
2	2
3	4
4	3
5	9
6	15
7	4
8	16
9	40
10	64
11	5
12	25
13	85
14	205
15	325
16	6
17	36
18	156
19	516
20	1236
21	1956
22	7
23	49
24	259
25	1099
26	3619
27	8659
28	13699
29	8
30	64
31	400
32	2080
33	8800
34	28960
35	69280
36	109600
37	9
38	81
39	585
40	3609
41	18729
42	79209
43	260649
44	623529
45	986409
46	10
47	100
48	820
49	5860
50	36100
51	187300
52	792100
53	2606500
54	6235300
55	9864100

[1, 2, 4, 3, 9, 15, 4, 16, 40, 64, 5, 25, 85, 205, 325, 6, 36, 156, 516, 1236, 1956, 7, 49, 259, 1099, 3619, 8659, 13699, 8, 64, 400, 2080, 8800, 28960, 69280, 109600, 9, 81, 585, 3609, 18729, 79209, 260649, 623529, 986409, 10, 100, 820, 5860, 36100, 187300, 792100, 2606500, 6235300, 9864100]

cp's OEIS Frontend

A285268 Triangle read by rows: T(m,n) = Sum_{i=1..n} P(m,i) where P(m,n) = m!/(m-n)! is the number of permutations of m items taken n at a time, for 1 <= n <= m.

Table of values

List of values