A298682 - cp's OEIS frontend

A298682 Start with the triangle with 4 markings of the Shield tiling and recursively apply the substitution rule. a(n) is the number of triangles with 4 markings after n iterations.

n	a(n)
0	1
1	2
2	4
3	8
4	28
5	92
6	352
7	1280
8	4828
9	17900
10	67024
11	249680
12	932716
13	3479132
14	12987904
15	48464288
16	180885628
17	675045452
18	2519361712
19	9402270320
20	35089981708
21	130957132220
22	488739595744
23	1823999153600
24	6807261212956
25	25405037309612
26	94812904802704

[1, 2, 4, 8, 28, 92, 352, 1280, 4828, 17900, 67024, 249680, 932716, 3479132, 12987904, 48464288, 180885628, 675045452, 2519361712, 9402270320, 35089981708, 130957132220, 488739595744, 1823999153600, 6807261212956, 25405037309612, 94812904802704]

cp's OEIS Frontend

A298682 Start with the triangle with 4 markings of the Shield tiling and recursively apply the substitution rule. a(n) is the number of triangles with 4 markings after n iterations.

Table of values

List of values