cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A298683 Start with the square tile of the Shield tiling and recursively apply the substitution rule. a(n) is the number of squares after n iterations.

Table of values

n a(n)
0 1
1 1
2 1
3 13
4 37
5 169
6 577
7 2269
8 8245
9 31225
10 115633
11 433357
12 1613701
13 6029641
14 22488481
15 83957053
16 313274197
17 1169270809
18 4363546897
19 16285441069
20 60777168805
21 226825331305
22 846519962113
23 3159262905757
24 11790514883701
25 44002830183481
26 164220738741361

List of values

[1, 1, 1, 13, 37, 169, 577, 2269, 8245, 31225, 115633, 433357, 1613701, 6029641, 22488481, 83957053, 313274197, 1169270809, 4363546897, 16285441069, 60777168805, 226825331305, 846519962113, 3159262905757, 11790514883701, 44002830183481, 164220738741361]