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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.

A219975 Number of tilings of an n X n square using straight (3 X 1) trominoes and 2 X 2 tiles.

Table of values

n a(n)
0 1
1 0
2 1
3 2
4 3
5 28
6 267
7 2744
8 66653
9 2766100
10 141365332
11 13305552648
12 2149055591278
13 493880634209398
14 192321197859269019
15 124351154502319720238
16 122893248485909264026734
17 199405053536180281080458422
18 527809383857797224536981601752

List of values

[1, 0, 1, 2, 3, 28, 267, 2744, 66653, 2766100, 141365332, 13305552648, 2149055591278, 493880634209398, 192321197859269019, 124351154502319720238, 122893248485909264026734, 199405053536180281080458422, 527809383857797224536981601752]

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

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