A134509 - cp's OEIS frontend

A134509 Triangular numbers remaining after arranging positive terms of A000217 in a triangle and removing an infinite number of "^"-shaped layers as described below.

n	a(n)
1	15
2	36
3	45
4	78
5	105
6	153
7	210
8	276
9	325
10	378
11	465
12	528
13	561
14	630
15	741
16	820
17	861
18	903
19	990
20	1128
21	1225
22	1275
23	1326
24	1378
25	1485
26	1653
27	1770
28	1830
29	1953
30	2016
31	2145
32	2346
33	2485
34	2556
35	2775
36	2850
37	3003
38	3240
39	3403
40	3486
41	3655
42	3828
43	3916
44	4095
45	4371
46	4560

[15, 36, 45, 78, 105, 153, 210, 276, 325, 378, 465, 528, 561, 630, 741, 820, 861, 903, 990, 1128, 1225, 1275, 1326, 1378, 1485, 1653, 1770, 1830, 1953, 2016, 2145, 2346, 2485, 2556, 2775, 2850, 3003, 3240, 3403, 3486, 3655, 3828, 3916, 4095, 4371, 4560]

cp's OEIS Frontend

A134509 Triangular numbers remaining after arranging positive terms of A000217 in a triangle and removing an infinite number of "^"-shaped layers as described below.

Table of values

List of values