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.

A316726 The number of ways to tile (with squares and rectangles) a 2 X (n+2) strip with the upper left and upper right squares removed.

Table of values

n a(n)
0 2
1 4
2 15
3 46
4 150
5 480
6 1545
7 4964
8 15958
9 51292
10 164871
11 529946
12 1703418
13 5475328
14 17599457
15 56570280
16 181834970
17 584475732
18 1878691887
19 6038716422
20 19410365422
21 62391120800
22 200545011401
23 644615789580
24 2072001259342
25 6660074556204
26 21407609138375

List of values

[2, 4, 15, 46, 150, 480, 1545, 4964, 15958, 51292, 164871, 529946, 1703418, 5475328, 17599457, 56570280, 181834970, 584475732, 1878691887, 6038716422, 19410365422, 62391120800, 200545011401, 644615789580, 2072001259342, 6660074556204, 21407609138375]

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

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