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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.

A352590 Number of tilings of a 4 X n rectangle using 2 X 2 and 1 X 1 tiles and dominoes.

Table of values

n a(n)
0 1
1 5
2 90
3 1125
4 15623
5 210690
6 2865581
7 38879777
8 527889422
9 7165926641
10 97281018915
11 1320614646178
12 17927775213129
13 243375024977525
14 3303891838175262
15 44851355548842869
16 608871075513683799
17 8265613771134660506
18 112208272012556064101
19 1523262112532452904985

List of values

[1, 5, 90, 1125, 15623, 210690, 2865581, 38879777, 527889422, 7165926641, 97281018915, 1320614646178, 17927775213129, 243375024977525, 3303891838175262, 44851355548842869, 608871075513683799, 8265613771134660506, 112208272012556064101, 1523262112532452904985]

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

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