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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.

A159294 Number of ways that a 1 X n rectangular tile T, marked into n unit squares, can be surrounded by one layer of copies of itself laid in the plane grid generated by the units of T. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.

Table of values

n a(n)
1 1
2 153
3 301
4 517
5 825
6 1234
7 1774
8 2454
9 3310
10 4351
11 5619
12 7123
13 8911
14 10992
15 13420
16 16204
17 19404
18 23029
19 27145
20 31761
21 36949
22 42718
23 49146
24 56242
25 64090
26 72699
27 82159
28 92479
29 103755
30 115996

List of values

[1, 153, 301, 517, 825, 1234, 1774, 2454, 3310, 4351, 5619, 7123, 8911, 10992, 13420, 16204, 19404, 23029, 27145, 31761, 36949, 42718, 49146, 56242, 64090, 72699, 82159, 92479, 103755, 115996]

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

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