A006578 - cp's OEIS frontend

A006578 Triangular numbers plus quarter squares: n*(n+1)/2 + floor(n^2/4) (i.e., A000217(n) + A002620(n)).

n	a(n)
0	0
1	1
2	4
3	8
4	14
5	21
6	30
7	40
8	52
9	65
10	80
11	96
12	114
13	133
14	154
15	176
16	200
17	225
18	252
19	280
20	310
21	341
22	374
23	408
24	444
25	481
26	520
27	560
28	602
29	645
30	690
31	736
32	784
33	833
34	884
35	936
36	990
37	1045
38	1102
39	1160
40	1220
41	1281
42	1344
43	1408
44	1474
45	1541
46	1610
47	1680
48	1752
49	1825
50	1900
51	1976
52	2054

[0, 1, 4, 8, 14, 21, 30, 40, 52, 65, 80, 96, 114, 133, 154, 176, 200, 225, 252, 280, 310, 341, 374, 408, 444, 481, 520, 560, 602, 645, 690, 736, 784, 833, 884, 936, 990, 1045, 1102, 1160, 1220, 1281, 1344, 1408, 1474, 1541, 1610, 1680, 1752, 1825, 1900, 1976, 2054]

cp's OEIS Frontend

A006578 Triangular numbers plus quarter squares: n*(n+1)/2 + floor(n^2/4) (i.e., A000217(n) + A002620(n)).

Table of values

List of values