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.

A128102 Number of 2 X 2 tiles in all tilings of a 4 X n rectangle with 1 X 1 and 2 X 2 square tiles.

Table of values

n a(n)
0 0
1 0
2 5
3 14
4 69
5 224
6 805
7 2610
8 8545
9 27068
10 85209
11 264406
12 814509
13 2488536
14 7558093
15 22827130
16 68625657
17 205455348
18 612884929
19 1822355742
20 5402974789
21 15977195792
22 47135117493
23 138757706946
24 407679684497
25 1195641350700

List of values

[0, 0, 5, 14, 69, 224, 805, 2610, 8545, 27068, 85209, 264406, 814509, 2488536, 7558093, 22827130, 68625657, 205455348, 612884929, 1822355742, 5402974789, 15977195792, 47135117493, 138757706946, 407679684497, 1195641350700]

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

Content is available under The OEIS End-User License Agreement.