A212791 - cp's OEIS frontend

A212791 Central binomial coefficient CB(n) purged of all primes exceeding (n+1)/2.

n	a(n)
1	1
2	1
3	1
4	2
5	2
6	4
7	1
8	2
9	18
10	36
11	6
12	12
13	12
14	24
15	45
16	90
17	10
18	20
19	2
20	4
21	84
22	168
23	14
24	28
25	700
26	1400
27	2700
28	5400
29	360
30	720
31	45
32	90
33	2970
34	5940
35	11550
36	23100
37	23100
38	46200
39	90090
40	180180
41	8580
42	17160
43	780
44	1560
45	70200
46	140400

[1, 1, 1, 2, 2, 4, 1, 2, 18, 36, 6, 12, 12, 24, 45, 90, 10, 20, 2, 4, 84, 168, 14, 28, 700, 1400, 2700, 5400, 360, 720, 45, 90, 2970, 5940, 11550, 23100, 23100, 46200, 90090, 180180, 8580, 17160, 780, 1560, 70200, 140400]

cp's OEIS Frontend

A212791 Central binomial coefficient CB(n) purged of all primes exceeding (n+1)/2.

Table of values

List of values