A278481 - cp's OEIS frontend

A278481 Number of neighbors of the n-th term in a full isosceles triangle read by rows.

n	a(n)
1	2
2	4
3	4
4	4
5	6
6	4
7	4
8	6
9	6
10	4
11	4
12	6
13	6
14	6
15	4
16	4
17	6
18	6
19	6
20	6
21	4
22	4
23	6
24	6
25	6
26	6
27	6
28	4
29	4
30	6
31	6
32	6
33	6
34	6
35	6
36	4
37	4
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	4
46	4
47	6
48	6
49	6
50	6
51	6
52	6
53	6
54	6
55	4
56	4
57	6
58	6
59	6
60	6
61	6
62	6
63	6
64	6
65	6
66	4
67	4
68	6
69	6
70	6
71	6
72	6
73	6
74	6
75	6
76	6
77	6
78	4
79	4
80	6
81	6
82	6
83	6
84	6
85	6
86	6
87	6
88	6
89	6
90	6
91	4

[2, 4, 4, 4, 6, 4, 4, 6, 6, 4, 4, 6, 6, 6, 4, 4, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4]

cp's OEIS Frontend

A278481 Number of neighbors of the n-th term in a full isosceles triangle read by rows.

Table of values

List of values

n	a(n)
1	2
2	4
3	4
4	4
5	6
6	4
7	4
8	6
9	6
10	4
11	4
12	6
13	6
14	6
15	4
16	4
17	6
18	6
19	6
20	6
21	4
22	4
23	6
24	6
25	6
26	6
27	6
28	4
29	4
30	6
31	6
32	6
33	6
34	6
35	6
36	4
37	4
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	4
46	4
47	6
48	6
49	6
50	6
51	6
52	6
53	6
54	6
55	4
56	4
57	6
58	6
59	6
60	6
61	6
62	6
63	6
64	6
65	6
66	4
67	4
68	6
69	6
70	6
71	6
72	6
73	6
74	6
75	6
76	6
77	6
78	4
79	4
80	6
81	6
82	6
83	6
84	6
85	6
86	6
87	6
88	6
89	6
90	6
91	4

n	a(n)
1	2
2	4
3	4
4	4
5	6
6	4
7	4
8	6
9	6
10	4
11	4
12	6
13	6
14	6
15	4
16	4
17	6
18	6
19	6
20	6
21	4
22	4
23	6
24	6
25	6
26	6
27	6
28	4
29	4
30	6
31	6
32	6
33	6
34	6
35	6
36	4
37	4
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	4
46	4
47	6
48	6
49	6
50	6
51	6
52	6
53	6
54	6
55	4
56	4
57	6
58	6
59	6
60	6
61	6
62	6
63	6
64	6
65	6
66	4
67	4
68	6
69	6
70	6
71	6
72	6
73	6
74	6
75	6
76	6
77	6
78	4
79	4
80	6
81	6
82	6
83	6
84	6
85	6
86	6
87	6
88	6
89	6
90	6
91	4

n	a(n)
1	2
2	4
3	4
4	4
5	6
6	4
7	4
8	6
9	6
10	4
11	4
12	6
13	6
14	6
15	4
16	4
17	6
18	6
19	6
20	6
21	4
22	4
23	6
24	6
25	6
26	6
27	6
28	4
29	4
30	6
31	6
32	6
33	6
34	6
35	6
36	4
37	4
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	4
46	4
47	6
48	6
49	6
50	6
51	6
52	6
53	6
54	6
55	4
56	4
57	6
58	6
59	6
60	6
61	6
62	6
63	6
64	6
65	6
66	4
67	4
68	6
69	6
70	6
71	6
72	6
73	6
74	6
75	6
76	6
77	6
78	4
79	4
80	6
81	6
82	6
83	6
84	6
85	6
86	6
87	6
88	6
89	6
90	6
91	4