A001859 - cp's OEIS frontend

A001859 Triangular numbers plus quarter-squares: n*(n+1)/2 + floor((n+1)^2/4) (i.e., A000217(n) + A002620(n+1)).

n	a(n)
0	0
1	2
2	5
3	10
4	16
5	24
6	33
7	44
8	56
9	70
10	85
11	102
12	120
13	140
14	161
15	184
16	208
17	234
18	261
19	290
20	320
21	352
22	385
23	420
24	456
25	494
26	533
27	574
28	616
29	660
30	705
31	752
32	800
33	850
34	901
35	954
36	1008
37	1064
38	1121
39	1180
40	1240
41	1302
42	1365
43	1430
44	1496
45	1564
46	1633
47	1704
48	1776
49	1850
50	1925

[0, 2, 5, 10, 16, 24, 33, 44, 56, 70, 85, 102, 120, 140, 161, 184, 208, 234, 261, 290, 320, 352, 385, 420, 456, 494, 533, 574, 616, 660, 705, 752, 800, 850, 901, 954, 1008, 1064, 1121, 1180, 1240, 1302, 1365, 1430, 1496, 1564, 1633, 1704, 1776, 1850, 1925]

cp's OEIS Frontend

A001859 Triangular numbers plus quarter-squares: n*(n+1)/2 + floor((n+1)^2/4) (i.e., A000217(n) + A002620(n+1)).

Table of values

List of values