A143978 - cp's OEIS frontend

A143978 a(n) = floor(2n(n+1)/3).

n	a(n)
1	1
2	4
3	8
4	13
5	20
6	28
7	37
8	48
9	60
10	73
11	88
12	104
13	121
14	140
15	160
16	181
17	204
18	228
19	253
20	280
21	308
22	337
23	368
24	400
25	433
26	468
27	504
28	541
29	580
30	620
31	661
32	704
33	748
34	793
35	840
36	888
37	937
38	988
39	1040
40	1093
41	1148
42	1204
43	1261
44	1320
45	1380
46	1441
47	1504
48	1568
49	1633
50	1700
51	1768
52	1837

[1, 4, 8, 13, 20, 28, 37, 48, 60, 73, 88, 104, 121, 140, 160, 181, 204, 228, 253, 280, 308, 337, 368, 400, 433, 468, 504, 541, 580, 620, 661, 704, 748, 793, 840, 888, 937, 988, 1040, 1093, 1148, 1204, 1261, 1320, 1380, 1441, 1504, 1568, 1633, 1700, 1768, 1837]

cp's OEIS Frontend

A143978 a(n) = floor(2n(n+1)/3).

Table of values

List of values

cp's OEIS Frontend

A143978 a(n) = floor(2*n*(n+1)/3).

Table of values

List of values

A143978 a(n) = floor(2n(n+1)/3).