A246257 - cp's OEIS frontend

A246257 Triangular array read by rows: T(n, k) = S(n, [n/2]-k) and S(n,k) = C(n, 2k)(2k-1)!!((2*k-1)!! + 1)/2, n>=0, 0<=k<=[n/2].

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	6
7	6
8	1
9	30
10	10
11	1
12	120
13	90
14	15
15	1
16	840
17	210
18	21
19	1
20	5565
21	3360
22	420
23	28
24	1
25	50085
26	10080
27	756
28	36
29	1
30	446985
31	250425
32	25200
33	1260
34	45
35	1
36	4916835
37	918225
38	55440
39	1980
40	55
41	1
42	54033210
43	29501010
44	2754675
45	110880
46	2970
47	66
48	1

[1, 1, 1, 1, 3, 1, 6, 6, 1, 30, 10, 1, 120, 90, 15, 1, 840, 210, 21, 1, 5565, 3360, 420, 28, 1, 50085, 10080, 756, 36, 1, 446985, 250425, 25200, 1260, 45, 1, 4916835, 918225, 55440, 1980, 55, 1, 54033210, 29501010, 2754675, 110880, 2970, 66, 1]

cp's OEIS Frontend

A246257 Triangular array read by rows: T(n, k) = S(n, [n/2]-k) and S(n,k) = C(n, 2k)(2k-1)!!((2*k-1)!! + 1)/2, n>=0, 0<=k<=[n/2].

Table of values

List of values

cp's OEIS Frontend

A246257 Triangular array read by rows: T(n, k) = S(n, [n/2]-k) and S(n,k) = C(n, 2*k)*(2*k-1)!!*((2*k-1)!! + 1)/2, n>=0, 0<=k<=[n/2].

Table of values

List of values

A246257 Triangular array read by rows: T(n, k) = S(n, [n/2]-k) and S(n,k) = C(n, 2k)(2k-1)!!((2*k-1)!! + 1)/2, n>=0, 0<=k<=[n/2].