A326657 - cp's OEIS frontend

A326657 a(n) = 4*floor(n/2) + ceiling((n-1)^2/2).

n	a(n)
0	1
1	0
2	5
3	6
4	13
5	16
6	25
7	30
8	41
9	48
10	61
11	70
12	85
13	96
14	113
15	126
16	145
17	160
18	181
19	198
20	221
21	240
22	265
23	286
24	313
25	336
26	365
27	390
28	421
29	448
30	481
31	510
32	545
33	576
34	613
35	646
36	685
37	720
38	761
39	798
40	841
41	880
42	925
43	966
44	1013
45	1056
46	1105
47	1150
48	1201
49	1248
50	1301
51	1350
52	1405
53	1456
54	1513
55	1566
56	1625
57	1680

[1, 0, 5, 6, 13, 16, 25, 30, 41, 48, 61, 70, 85, 96, 113, 126, 145, 160, 181, 198, 221, 240, 265, 286, 313, 336, 365, 390, 421, 448, 481, 510, 545, 576, 613, 646, 685, 720, 761, 798, 841, 880, 925, 966, 1013, 1056, 1105, 1150, 1201, 1248, 1301, 1350, 1405, 1456, 1513, 1566, 1625, 1680]

cp's OEIS Frontend

A326657 a(n) = 4*floor(n/2) + ceiling((n-1)^2/2).

Table of values

List of values