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.

A278630 Number of nX4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes.

Table of values

n a(n)
1 15
2 3354
3 234484
4 10776210
5 387551595
6 11719632199
7 309971214338
8 7350438329498
9 158870607154260
10 3165150394868325
11 58584816738347925
12 1013219703287606525
13 16445858865221341430
14 251416530890380206352

List of values

[15, 3354, 234484, 10776210, 387551595, 11719632199, 309971214338, 7350438329498, 158870607154260, 3165150394868325, 58584816738347925, 1013219703287606525, 16445858865221341430, 251416530890380206352]

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

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