A244490 - cp's OEIS frontend

A244490 Triangle read by rows: T(n,k) (0 <= k <= n) = Sum_{i=0..[k/2]} (-1)^ibinomial(k,2i)(2i-1)!!n^(k-2i).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	3
6	1
7	3
8	8
9	18
10	1
11	4
12	15
13	52
14	163
15	1
16	5
17	24
18	110
19	478
20	1950
21	1
22	6
23	35
24	198
25	1083
26	5706
27	28821
28	1
29	7
30	48
31	322
32	2110
33	13482
34	83824
35	505876
36	1
37	8
38	63
39	488
40	3715
41	27768
42	203569
43	1461944
44	10270569
45	1
46	9
47	80
48	702
49	6078
50	51894
51	436656
52	3618540
53	29510268
54	236644092
55	1
56	10
57	99
58	970
59	9403
60	90150
61	854485
62	8003950
63	74058105
64	676549450
65	6098971555

[1, 1, 1, 1, 2, 3, 1, 3, 8, 18, 1, 4, 15, 52, 163, 1, 5, 24, 110, 478, 1950, 1, 6, 35, 198, 1083, 5706, 28821, 1, 7, 48, 322, 2110, 13482, 83824, 505876, 1, 8, 63, 488, 3715, 27768, 203569, 1461944, 10270569, 1, 9, 80, 702, 6078, 51894, 436656, 3618540, 29510268, 236644092, 1, 10, 99, 970, 9403, 90150, 854485, 8003950, 74058105, 676549450, 6098971555]

cp's OEIS Frontend

A244490 Triangle read by rows: T(n,k) (0 <= k <= n) = Sum_{i=0..[k/2]} (-1)^ibinomial(k,2i)(2i-1)!!n^(k-2i).

Table of values

List of values

cp's OEIS Frontend

A244490 Triangle read by rows: T(n,k) (0 <= k <= n) = Sum_{i=0..[k/2]} (-1)^i*binomial(k,2*i)*(2*i-1)!!*n^(k-2*i).

Table of values

List of values

A244490 Triangle read by rows: T(n,k) (0 <= k <= n) = Sum_{i=0..[k/2]} (-1)^ibinomial(k,2i)(2i-1)!!n^(k-2i).