A023986 - cp's OEIS frontend

A023986 Sum of exponents of primes in C(4n,2n) - sum of exponents of primes in C(2n,n).

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	1
6	2
7	5
8	3
9	5
10	6
11	4
12	6
13	6
14	3
15	4
16	6
17	5
18	4
19	6
20	5
21	8
22	10
23	7
24	9
25	9
26	7
27	9
28	8
29	7
30	10
31	12
32	10
33	9
34	13
35	11
36	13
37	16
38	12
39	13
40	14
41	9
42	11
43	12
44	12
45	13
46	12
47	12
48	13
49	15
50	11
51	13
52	16
53	13
54	15
55	17
56	16
57	19
58	19
59	16
60	15
61	17
62	18
63	15
64	18
65	17
66	19
67	19
68	13
69	17
70	19
71	17
72	18
73	18
74	15
75	19
76	21
77	18
78	17
79	20
80	19
81	19
82	22
83	19
84	22

[0, 1, 1, 2, 3, 1, 2, 5, 3, 5, 6, 4, 6, 6, 3, 4, 6, 5, 4, 6, 5, 8, 10, 7, 9, 9, 7, 9, 8, 7, 10, 12, 10, 9, 13, 11, 13, 16, 12, 13, 14, 9, 11, 12, 12, 13, 12, 12, 13, 15, 11, 13, 16, 13, 15, 17, 16, 19, 19, 16, 15, 17, 18, 15, 18, 17, 19, 19, 13, 17, 19, 17, 18, 18, 15, 19, 21, 18, 17, 20, 19, 19, 22, 19, 22]

cp's OEIS Frontend

A023986 Sum of exponents of primes in C(4n,2n) - sum of exponents of primes in C(2n,n).

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	1
6	2
7	5
8	3
9	5
10	6
11	4
12	6
13	6
14	3
15	4
16	6
17	5
18	4
19	6
20	5
21	8
22	10
23	7
24	9
25	9
26	7
27	9
28	8
29	7
30	10
31	12
32	10
33	9
34	13
35	11
36	13
37	16
38	12
39	13
40	14
41	9
42	11
43	12
44	12
45	13
46	12
47	12
48	13
49	15
50	11
51	13
52	16
53	13
54	15
55	17
56	16
57	19
58	19
59	16
60	15
61	17
62	18
63	15
64	18
65	17
66	19
67	19
68	13
69	17
70	19
71	17
72	18
73	18
74	15
75	19
76	21
77	18
78	17
79	20
80	19
81	19
82	22
83	19
84	22

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	1
6	2
7	5
8	3
9	5
10	6
11	4
12	6
13	6
14	3
15	4
16	6
17	5
18	4
19	6
20	5
21	8
22	10
23	7
24	9
25	9
26	7
27	9
28	8
29	7
30	10
31	12
32	10
33	9
34	13
35	11
36	13
37	16
38	12
39	13
40	14
41	9
42	11
43	12
44	12
45	13
46	12
47	12
48	13
49	15
50	11
51	13
52	16
53	13
54	15
55	17
56	16
57	19
58	19
59	16
60	15
61	17
62	18
63	15
64	18
65	17
66	19
67	19
68	13
69	17
70	19
71	17
72	18
73	18
74	15
75	19
76	21
77	18
78	17
79	20
80	19
81	19
82	22
83	19
84	22

n	a(n)
0	0
1	1
2	1
3	2
4	3
5	1
6	2
7	5
8	3
9	5
10	6
11	4
12	6
13	6
14	3
15	4
16	6
17	5
18	4
19	6
20	5
21	8
22	10
23	7
24	9
25	9
26	7
27	9
28	8
29	7
30	10
31	12
32	10
33	9
34	13
35	11
36	13
37	16
38	12
39	13
40	14
41	9
42	11
43	12
44	12
45	13
46	12
47	12
48	13
49	15
50	11
51	13
52	16
53	13
54	15
55	17
56	16
57	19
58	19
59	16
60	15
61	17
62	18
63	15
64	18
65	17
66	19
67	19
68	13
69	17
70	19
71	17
72	18
73	18
74	15
75	19
76	21
77	18
78	17
79	20
80	19
81	19
82	22
83	19
84	22