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.

A059021 Number of 3 X n checkerboards (with at least one red square) in which the set of red squares is edge-connected.

Table of values

n a(n)
0 0
1 6
2 40
3 218
4 1126
5 5726
6 28992
7 146642
8 741556
9 3749816
10 18961450
11 95880894
12 484833212
13 2451616864
14 12396892316
15 62686360476
16 316981037374
17 1602852315476
18 8105013367472
19 40983964057352
20 207240288658392

List of values

[0, 6, 40, 218, 1126, 5726, 28992, 146642, 741556, 3749816, 18961450, 95880894, 484833212, 2451616864, 12396892316, 62686360476, 316981037374, 1602852315476, 8105013367472, 40983964057352, 207240288658392]

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

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