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.

A130867 Triangular polyominoes (or polyiamonds) with n cells at most (turning over is allowed, holes are allowed, must be connected along edges).

Table of values

n a(n)
1 1
2 2
3 3
4 6
5 10
6 22
7 46
8 112
9 272
10 720
11 1906
12 5240
13 14475
14 40641
15 114624
16 325921
17 930028
18 2666356
19 7666949
20 22115933
21 63951671
22 185370931
23 538416222
24 1566868939
25 4567669566
26 13336886288
27 38998848186
28 114194014853

List of values

[1, 2, 3, 6, 10, 22, 46, 112, 272, 720, 1906, 5240, 14475, 40641, 114624, 325921, 930028, 2666356, 7666949, 22115933, 63951671, 185370931, 538416222, 1566868939, 4567669566, 13336886288, 38998848186, 114194014853]

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

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