A333700 - cp's OEIS frontend

A333700 a(n) = Sum_{k=1..n} pi(k) * pi(n-k).

n	a(n)
1	0
2	0
3	0
4	1
5	4
6	8
7	14
8	22
9	32
10	45
11	58
12	73
13	90
14	110
15	132
16	158
17	184
18	214
19	246
20	282
21	320
22	363
23	406
24	455
25	506
26	562
27	618
28	678
29	738
30	804
31	872
32	944
33	1018
34	1099
35	1180
36	1269
37	1358
38	1450
39	1544
40	1644
41	1744
42	1852
43	1962
44	2078
45	2196
46	2321
47	2446
48	2581
49	2718
50	2863

[0, 0, 0, 1, 4, 8, 14, 22, 32, 45, 58, 73, 90, 110, 132, 158, 184, 214, 246, 282, 320, 363, 406, 455, 506, 562, 618, 678, 738, 804, 872, 944, 1018, 1099, 1180, 1269, 1358, 1450, 1544, 1644, 1744, 1852, 1962, 2078, 2196, 2321, 2446, 2581, 2718, 2863]

cp's OEIS Frontend

A333700 a(n) = Sum_{k=1..n} pi(k) * pi(n-k).

Table of values

List of values