A085572 - cp's OEIS frontend

A085572 Denominator of 2Sum(C(n,w)/w,w=1..n/2-1)+C(n, n/2)/(n/2) if n is even otherwise of 2Sum(C(n,w)/w,w=1..(n-1)/2).

n	a(n)
2	1
3	1
4	1
5	1
6	3
7	3
8	6
9	1
10	5
11	5
12	30
13	30
14	210
15	210
16	420
17	210
18	630
19	630
20	315
21	315
22	3465
23	3465
24	13860
25	2772
26	36036
27	12012
28	12012
29	1716
30	8580
31	8580
32	17160
33	8580
34	145860
35	204204
36	612612
37	612612
38	11639628
39	11639628
40	29099070
41	29099070
42	29099070
43	29099070
44	1322685
45	14549535

[1, 1, 1, 1, 3, 3, 6, 1, 5, 5, 30, 30, 210, 210, 420, 210, 630, 630, 315, 315, 3465, 3465, 13860, 2772, 36036, 12012, 12012, 1716, 8580, 8580, 17160, 8580, 145860, 204204, 612612, 612612, 11639628, 11639628, 29099070, 29099070, 29099070, 29099070, 1322685, 14549535]

cp's OEIS Frontend

A085572 Denominator of 2Sum(C(n,w)/w,w=1..n/2-1)+C(n, n/2)/(n/2) if n is even otherwise of 2Sum(C(n,w)/w,w=1..(n-1)/2).

Table of values

List of values

cp's OEIS Frontend

A085572 Denominator of 2*Sum(C(n,w)/w,w=1..n/2-1)+C(n, n/2)/(n/2) if n is even otherwise of 2*Sum(C(n,w)/w,w=1..(n-1)/2).

Table of values

List of values

A085572 Denominator of 2Sum(C(n,w)/w,w=1..n/2-1)+C(n, n/2)/(n/2) if n is even otherwise of 2Sum(C(n,w)/w,w=1..(n-1)/2).