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.

A212404 Number of binary arrays of length 2*n+2 with no more than n ones in any length 2n subsequence (=50% duty cycle).

Table of values

n a(n)
1 8
2 33
3 132
4 527
5 2104
6 8402
7 33560
8 134075
9 535728
10 2140910
11 8556568
12 34201078
13 136713872
14 546528612
15 2184925808
16 8735357267
17 34925461088
18 139642914902
19 558353310488
20 2232601256162
21 8927375430608
22 35698163696252
23 142750104755408

List of values

[8, 33, 132, 527, 2104, 8402, 33560, 134075, 535728, 2140910, 8556568, 34201078, 136713872, 546528612, 2184925808, 8735357267, 34925461088, 139642914902, 558353310488, 2232601256162, 8927375430608, 35698163696252, 142750104755408]

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

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