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.

A213122 Number of binary arrays of length 2*n+4 with fewer than n ones in any length 2n subsequence (=less than 50% duty cycle).

Table of values

n a(n)
1 1
2 19
3 136
4 714
5 3354
6 14946
7 64664
8 274676
9 1152494
10 4793874
11 19813536
12 81495084
13 333932596
14 1364199604
15 5559496912
16 22610923448
17 91805888342
18 372224952818
19 1507347830672
20 6097720950428
21 24644919356012
22 99527343620348

List of values

[1, 19, 136, 714, 3354, 14946, 64664, 274676, 1152494, 4793874, 19813536, 81495084, 333932596, 1364199604, 5559496912, 22610923448, 91805888342, 372224952818, 1507347830672, 6097720950428, 24644919356012, 99527343620348]

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

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