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.

A212406 Number of binary arrays of length 2*n+4 with no more than n ones in any length 2n subsequence (=50% duty cycle).

Table of values

n a(n)
1 21
2 97
3 421
4 1747
5 7143
6 29002
7 117290
8 473171
9 1905675
10 7665886
11 30810054
12 123745422
13 496747206
14 1993227892
15 7995168852
16 32060722883
17 128532812627
18 515187798518
19 2064622548782
20 8272744298618
21 33143688036722
22 132770436380108

List of values

[21, 97, 421, 1747, 7143, 29002, 117290, 473171, 1905675, 7665886, 30810054, 123745422, 496747206, 1993227892, 7995168852, 32060722883, 128532812627, 515187798518, 2064622548782, 8272744298618, 33143688036722, 132770436380108]

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

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