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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.

A282389 Number of squares in triangle-shaped polyominoes obtained by adding three identical polyominoes to the previous one, starting with one L-tetromino.

Table of values

n a(n)
0 4
1 10
2 25
3 70
4 238
5 901
6 3445
7 13390
8 52942
9 210226
10 838450
11 3350725
12 13393093
13 53547790
14 214151950
15 856558645
16 3426077749
17 13703917774
18 54815043790
19 219258602290
20 877031899954
21 3508124454085
22 14032487779525
23 56129938535185
24 224519713993489
25 898078755310654

List of values

[4, 10, 25, 70, 238, 901, 3445, 13390, 52942, 210226, 838450, 3350725, 13393093, 53547790, 214151950, 856558645, 3426077749, 13703917774, 54815043790, 219258602290, 877031899954, 3508124454085, 14032487779525, 56129938535185, 224519713993489, 898078755310654]

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

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