A085789 - cp's OEIS frontend

A085789 Partial sums of n 3-spaced triangular numbers beginning with t(2), e.g., a(2) = t(2) + t(5) = 3 + 15 = 18.

n	a(n)
1	3
2	18
3	54
4	120
5	225
6	378
7	588
8	864
9	1215
10	1650
11	2178
12	2808
13	3549
14	4410
15	5400
16	6528
17	7803
18	9234
19	10830
20	12600
21	14553
22	16698
23	19044
24	21600
25	24375
26	27378
27	30618
28	34104
29	37845
30	41850
31	46128
32	50688
33	55539
34	60690
35	66150
36	71928
37	78033
38	84474
39	91260
40	98400
41	105903

[3, 18, 54, 120, 225, 378, 588, 864, 1215, 1650, 2178, 2808, 3549, 4410, 5400, 6528, 7803, 9234, 10830, 12600, 14553, 16698, 19044, 21600, 24375, 27378, 30618, 34104, 37845, 41850, 46128, 50688, 55539, 60690, 66150, 71928, 78033, 84474, 91260, 98400, 105903]

cp's OEIS Frontend

A085789 Partial sums of n 3-spaced triangular numbers beginning with t(2), e.g., a(2) = t(2) + t(5) = 3 + 15 = 18.

Table of values

List of values