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.

A212403 Number of binary arrays of length 2*n+1 with no more than n ones in any length 2n subsequence (=50% duty cycle).

Table of values

n a(n)
1 5
2 19
3 74
4 291
5 1150
6 4558
7 18100
8 71971
9 286454
10 1140954
11 4547020
12 18129294
13 72309164
14 288493756
15 1151300584
16 4595507491
17 18346672294
18 73257044386
19 292550538844
20 1168434892186
21 4667175448324
22 18644235526276
23 74485459541464

List of values

[5, 19, 74, 291, 1150, 4558, 18100, 71971, 286454, 1140954, 4547020, 18129294, 72309164, 288493756, 1151300584, 4595507491, 18346672294, 73257044386, 292550538844, 1168434892186, 4667175448324, 18644235526276, 74485459541464]

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

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