A264104 - cp's OEIS frontend

A264104 Numbers n with the property that the symmetric representation of sigma(n) has four parts, each of width one and two regions meet at the center of the Dyck path.

n	a(n)
1	21
2	55
3	253
4	406
5	1081
6	1378
7	1711
8	3403
9	3916
10	5671
11	9316
12	11026
13	13861
14	14878
15	15931
16	25651
17	27028
18	34453
19	36046
20	42778
21	50086
22	60031
23	64261
24	73153
25	75466
26	108811
27	114481
28	126253
29	129286
30	154846
31	158203
32	161596
33	171991
34	175528
35	212878
36	258121
37	298378
38	317206
39	326836
40	351541
41	366796
42	371953
43	392941

[21, 55, 253, 406, 1081, 1378, 1711, 3403, 3916, 5671, 9316, 11026, 13861, 14878, 15931, 25651, 27028, 34453, 36046, 42778, 50086, 60031, 64261, 73153, 75466, 108811, 114481, 126253, 129286, 154846, 158203, 161596, 171991, 175528, 212878, 258121, 298378, 317206, 326836, 351541, 366796, 371953, 392941]

cp's OEIS Frontend

A264104 Numbers n with the property that the symmetric representation of sigma(n) has four parts, each of width one and two regions meet at the center of the Dyck path.

Table of values

List of values