A005448 - cp's OEIS frontend

A005448 Centered triangular numbers: a(n) = 3n(n-1)/2 + 1.

n	a(n)
1	1
2	4
3	10
4	19
5	31
6	46
7	64
8	85
9	109
10	136
11	166
12	199
13	235
14	274
15	316
16	361
17	409
18	460
19	514
20	571
21	631
22	694
23	760
24	829
25	901
26	976
27	1054
28	1135
29	1219
30	1306
31	1396
32	1489
33	1585
34	1684
35	1786
36	1891
37	1999
38	2110
39	2224
40	2341
41	2461
42	2584
43	2710
44	2839
45	2971
46	3106
47	3244
48	3385
49	3529

[1, 4, 10, 19, 31, 46, 64, 85, 109, 136, 166, 199, 235, 274, 316, 361, 409, 460, 514, 571, 631, 694, 760, 829, 901, 976, 1054, 1135, 1219, 1306, 1396, 1489, 1585, 1684, 1786, 1891, 1999, 2110, 2224, 2341, 2461, 2584, 2710, 2839, 2971, 3106, 3244, 3385, 3529]

cp's OEIS Frontend

A005448 Centered triangular numbers: a(n) = 3n(n-1)/2 + 1.

Table of values

List of values

cp's OEIS Frontend

A005448 Centered triangular numbers: a(n) = 3*n*(n-1)/2 + 1.

Table of values

List of values

A005448 Centered triangular numbers: a(n) = 3n(n-1)/2 + 1.