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.

A330844 Start with a Koch snowflake tile, and repeatedly append along the tiles of the previous step tiles scaled by a factor of sqrt(1/3) and rotated by 90 degrees that do not overlap with any prior tile and of which one third of the perimeter matches one sixth of the perimeter of adjacent prior tiles; a(n) gives the number of tiles appended at n-th step.

Table of values

n a(n)
1 1
2 6
3 18
4 42
5 90
6 186
7 366
8 690
9 1278
10 2322
11 4182
12 7482
13 13326
14 23682
15 42006
16 74442
17 131838
18 233394
19 413094
20 731034
21 1293582
22 2288898
23 4049910
24 7165674
25 12678366
26 22431954
27 39688902
28 70221498
29 124242606
30 219821730
31 388929174
32 688129674
33 1217502846
34 2154118770

List of values

[1, 6, 18, 42, 90, 186, 366, 690, 1278, 2322, 4182, 7482, 13326, 23682, 42006, 74442, 131838, 233394, 413094, 731034, 1293582, 2288898, 4049910, 7165674, 12678366, 22431954, 39688902, 70221498, 124242606, 219821730, 388929174, 688129674, 1217502846, 2154118770]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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