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.

A084481 Number of fault-free tilings of a 4 X 2n rectangle with L tetrominoes.

Table of values

n a(n)
1 2
2 6
3 10
4 18
5 38
6 84
7 186
8 410
9 904
10 1994
11 4398
12 9700
13 21394
14 47186
15 104072
16 229538
17 506262
18 1116596
19 2462730
20 5431722
21 11980040
22 26422810
23 58277342
24 128534724
25 283492258
26 625261858
27 1379058440
28 3041609138
29 6708480134
30 14796018708
31 32633646554
32 71975773242

List of values

[2, 6, 10, 18, 38, 84, 186, 410, 904, 1994, 4398, 9700, 21394, 47186, 104072, 229538, 506262, 1116596, 2462730, 5431722, 11980040, 26422810, 58277342, 128534724, 283492258, 625261858, 1379058440, 3041609138, 6708480134, 14796018708, 32633646554, 71975773242]

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

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