A212649 - cp's OEIS frontend

A212649 a(n) = floor(Sum_{k=0..n-1} sqrt(n^2 - k^2)).

n	a(n)
1	1
2	3
3	8
4	13
5	21
6	30
7	41
8	53
9	67
10	82
11	99
12	118
13	138
14	159
15	183
16	207
17	234
18	262
19	291
20	322
21	355
22	389
23	425
24	462
25	501
26	542
27	584
28	628
29	673
30	720
31	768
32	818
33	870
34	923
35	977
36	1034
37	1091
38	1151
39	1212
40	1274
41	1338
42	1404
43	1471
44	1540
45	1610
46	1682
47	1756
48	1831
49	1908
50	1986
51	2066

[1, 3, 8, 13, 21, 30, 41, 53, 67, 82, 99, 118, 138, 159, 183, 207, 234, 262, 291, 322, 355, 389, 425, 462, 501, 542, 584, 628, 673, 720, 768, 818, 870, 923, 977, 1034, 1091, 1151, 1212, 1274, 1338, 1404, 1471, 1540, 1610, 1682, 1756, 1831, 1908, 1986, 2066]

cp's OEIS Frontend

A212649 a(n) = floor(Sum_{k=0..n-1} sqrt(n^2 - k^2)).

Table of values

List of values