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.

A298679 Start with the hexagonal tile of the Shield tiling and recursively apply the substitution rule. a(n) is the number of square tiles after n iterations.

Table of values

n a(n)
0 0
1 3
2 6
3 33
4 102
5 423
6 1494
7 5745
8 21102
9 79431
10 295086
11 1103985
12 4114710
13 15367143
14 57329286
15 213999153
16 798569022
17 2980473543
18 11122931934
19 41512040625
20 154923657702
21 578185735911
22 2157812994486
23 8053078824945
24 30054477139470
25 112164880064583

List of values

[0, 3, 6, 33, 102, 423, 1494, 5745, 21102, 79431, 295086, 1103985, 4114710, 15367143, 57329286, 213999153, 798569022, 2980473543, 11122931934, 41512040625, 154923657702, 578185735911, 2157812994486, 8053078824945, 30054477139470, 112164880064583]