A323183 - cp's OEIS frontend

A323183 Consider the family of configurations E where E(0) consists of a single equilateral triangle, and for any k >= 0, E(k+1) is obtained by applying the Equithirds substitution to E(k). For k >= 5, the central node of E(k) has 6 equivalent tetravalent neighbors; let t(k) be the coordination sequence for one of those tetravalent nodes. This sequence is the limit of t(k) as k goes to infinity.

n	a(n)
0	1
1	4
2	20
3	39
4	55
5	71
6	91
7	107
8	129
9	147
10	165
11	181
12	197
13	217
14	233
15	253
16	269
17	289
18	305
19	325
20	341
21	361
22	377
23	399
24	417
25	435
26	453
27	471
28	489
29	507
30	525
31	543
32	559
33	575
34	595
35	611
36	631
37	647
38	667
39	683
40	703
41	719
42	739
43	755
44	775
45	791
46	811
47	827
48	847
49	863
50	883
51	899
52	919
53	935

[1, 4, 20, 39, 55, 71, 91, 107, 129, 147, 165, 181, 197, 217, 233, 253, 269, 289, 305, 325, 341, 361, 377, 399, 417, 435, 453, 471, 489, 507, 525, 543, 559, 575, 595, 611, 631, 647, 667, 683, 703, 719, 739, 755, 775, 791, 811, 827, 847, 863, 883, 899, 919, 935]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
0	1
1	4
2	20
3	39
4	55
5	71
6	91
7	107
8	129
9	147
10	165
11	181
12	197
13	217
14	233
15	253
16	269
17	289
18	305
19	325
20	341
21	361
22	377
23	399
24	417
25	435
26	453
27	471
28	489
29	507
30	525
31	543
32	559
33	575
34	595
35	611
36	631
37	647
38	667
39	683
40	703
41	719
42	739
43	755
44	775
45	791
46	811
47	827
48	847
49	863
50	883
51	899
52	919
53	935

n	a(n)
0	1
1	4
2	20
3	39
4	55
5	71
6	91
7	107
8	129
9	147
10	165
11	181
12	197
13	217
14	233
15	253
16	269
17	289
18	305
19	325
20	341
21	361
22	377
23	399
24	417
25	435
26	453
27	471
28	489
29	507
30	525
31	543
32	559
33	575
34	595
35	611
36	631
37	647
38	667
39	683
40	703
41	719
42	739
43	755
44	775
45	791
46	811
47	827
48	847
49	863
50	883
51	899
52	919
53	935

n	a(n)
0	1
1	4
2	20
3	39
4	55
5	71
6	91
7	107
8	129
9	147
10	165
11	181
12	197
13	217
14	233
15	253
16	269
17	289
18	305
19	325
20	341
21	361
22	377
23	399
24	417
25	435
26	453
27	471
28	489
29	507
30	525
31	543
32	559
33	575
34	595
35	611
36	631
37	647
38	667
39	683
40	703
41	719
42	739
43	755
44	775
45	791
46	811
47	827
48	847
49	863
50	883
51	899
52	919
53	935