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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.

A216581 Number of distinct connected planar figures that can be formed from n 1x2 rectangles (or dominoes) such that each pair of touching rectangles shares exactly one edge, of length 1, and the adjacency graph of the rectangles is a tree.

Table of values

n a(n)
0 1
1 2
2 14
3 114
4 1038
5 10042
6 101046
7 1044712
8 11018478
9 117996288
10 1278942418
11 13998440610
12 154462050186

List of values

[1, 2, 14, 114, 1038, 10042, 101046, 1044712, 11018478, 117996288, 1278942418, 13998440610, 154462050186]

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

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