A060544 - cp's OEIS frontend

A060544 Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1.

n	a(n)
1	1
2	10
3	28
4	55
5	91
6	136
7	190
8	253
9	325
10	406
11	496
12	595
13	703
14	820
15	946
16	1081
17	1225
18	1378
19	1540
20	1711
21	1891
22	2080
23	2278
24	2485
25	2701
26	2926
27	3160
28	3403
29	3655
30	3916
31	4186
32	4465
33	4753
34	5050
35	5356
36	5671
37	5995
38	6328
39	6670
40	7021
41	7381
42	7750
43	8128
44	8515
45	8911
46	9316

[1, 10, 28, 55, 91, 136, 190, 253, 325, 406, 496, 595, 703, 820, 946, 1081, 1225, 1378, 1540, 1711, 1891, 2080, 2278, 2485, 2701, 2926, 3160, 3403, 3655, 3916, 4186, 4465, 4753, 5050, 5356, 5671, 5995, 6328, 6670, 7021, 7381, 7750, 8128, 8515, 8911, 9316]

cp's OEIS Frontend

A060544 Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1.

Table of values

List of values