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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.

A247772 Number of tilings of a 5 X n rectangle using n pentominoes of any but the U shape.

Table of values

n a(n)
0 1
1 1
2 5
3 39
4 369
5 2908
6 19185
7 137200
8 1022915
9 7606043
10 55699672
11 405617356
12 2969215193
13 21791407596
14 159806458014
15 1170659384512
16 8574740528977
17 62830753812692
18 460445907547463
19 3374031670320652
20 24722398637797408
21 181148733466258107
22 1327366881461315358

List of values

[1, 1, 5, 39, 369, 2908, 19185, 137200, 1022915, 7606043, 55699672, 405617356, 2969215193, 21791407596, 159806458014, 1170659384512, 8574740528977, 62830753812692, 460445907547463, 3374031670320652, 24722398637797408, 181148733466258107, 1327366881461315358]

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

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