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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.

A127870 Number of tilings of a 4 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

Table of values

n a(n)
0 1
1 1
2 33
3 195
4 2023
5 16839
6 151817
7 1328849
8 11758369
9 103628653
10 914646205
11 8068452381
12 71189251649
13 628067760289
14 5541284098945
15 48888866203241
16 431331449340441
17 3805499681885145
18 33574725778806817
19 296219181642118401
20 2613448287490035073

List of values

[1, 1, 33, 195, 2023, 16839, 151817, 1328849, 11758369, 103628653, 914646205, 8068452381, 71189251649, 628067760289, 5541284098945, 48888866203241, 431331449340441, 3805499681885145, 33574725778806817, 296219181642118401, 2613448287490035073]

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

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