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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.

A159295 Number of ways that a tile in the form of a strip of n congruent regular hexagons stuck together on successive parallel edges can be surrounded by one layer of copies of itself in a plane. 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
2 721
3 1842
4 4025
5 7856
6 14124
7 23936
8 38654
9 60090
10 90407
11 132374
12 189223
13 264972
14 364230
15 492596
16 656404
17 863206
18 1121449
19 1441050
20 1832997
21 2310024
22 2886128
23 3577352
24 4401210
25 5377586
26 6528059
27 7876926
28 9450419
29 11277860

List of values

[1, 721, 1842, 4025, 7856, 14124, 23936, 38654, 60090, 90407, 132374, 189223, 264972, 364230, 492596, 656404, 863206, 1121449, 1441050, 1832997, 2310024, 2886128, 3577352, 4401210, 5377586, 6528059, 7876926, 9450419, 11277860]

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

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