A227849 - cp's OEIS frontend

A227849 a(n) = 2 * floor( 3/14 * n^2) if n even, a(n) = 2 * round( 3/14 * n^2) -1 if n odd.

n	a(n)
0	0
1	-1
2	0
3	3
4	6
5	9
6	14
7	21
8	26
9	33
10	42
11	51
12	60
13	71
14	84
15	95
16	108
17	123
18	138
19	153
20	170
21	189
22	206
23	225
24	246
25	267
26	288
27	311
28	336
29	359
30	384
31	411
32	438
33	465
34	494
35	525
36	554
37	585
38	618
39	651
40	684
41	719
42	756
43	791
44	828
45	867
46	906
47	945
48	986
49	1029
50	1070
51	1113
52	1158
53	1203
54	1248

[0, -1, 0, 3, 6, 9, 14, 21, 26, 33, 42, 51, 60, 71, 84, 95, 108, 123, 138, 153, 170, 189, 206, 225, 246, 267, 288, 311, 336, 359, 384, 411, 438, 465, 494, 525, 554, 585, 618, 651, 684, 719, 756, 791, 828, 867, 906, 945, 986, 1029, 1070, 1113, 1158, 1203, 1248]

cp's OEIS Frontend

A227849 a(n) = 2 * floor( 3/14 * n^2) if n even, a(n) = 2 * round( 3/14 * n^2) -1 if n odd.

Table of values

List of values