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.

A219689 Number of 5Xn arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 5Xn array.

Table of values

n a(n)
1 15
2 35
3 269
4 1688
5 8964
6 44736
7 219216
8 1062133
9 5046678
10 23361295
11 105246826
12 462379361
13 1984693730
14 8329188237
15 34174571720
16 137072090506
17 537533392034
18 2061741321158
19 7738348853856
20 28437341923159
21 102381325106959

List of values

[15, 35, 269, 1688, 8964, 44736, 219216, 1062133, 5046678, 23361295, 105246826, 462379361, 1984693730, 8329188237, 34174571720, 137072090506, 537533392034, 2061741321158, 7738348853856, 28437341923159, 102381325106959]

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

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