A298680 - cp's OEIS frontend

A298680 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 6 markings after n iterations.

n	a(n)
0	0
1	0
2	4
3	12
4	56
5	192
6	756
7	2748
8	10408
9	38544
10	144452
11	537900
12	2009880
13	7496160
14	27985684
15	104424732
16	389756936
17	1454515632
18	5428480356
19	20259056268
20	75608443768
21	282173320704
22	1053087635252
23	3930171627900
24	14667610061160
25	54740246247120
26	204293419666564

[0, 0, 4, 12, 56, 192, 756, 2748, 10408, 38544, 144452, 537900, 2009880, 7496160, 27985684, 104424732, 389756936, 1454515632, 5428480356, 20259056268, 75608443768, 282173320704, 1053087635252, 3930171627900, 14667610061160, 54740246247120, 204293419666564]

cp's OEIS Frontend

A298680 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 6 markings after n iterations.

Table of values

List of values