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.

A250523 Number of (n+1)X(4+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.

Table of values

n a(n)
1 3123
2 18859
3 82023
4 300131
5 993123
6 3088923
7 9240559
8 26984403
9 77707851
10 222271083
11 634724183
12 1815888579
13 5216209523
14 15062616251
15 43743061503
16 127741126963
17 374944674139
18 1105460634123
19 3271582279911
20 9712201092643

List of values

[3123, 18859, 82023, 300131, 993123, 3088923, 9240559, 26984403, 77707851, 222271083, 634724183, 1815888579, 5216209523, 15062616251, 43743061503, 127741126963, 374944674139, 1105460634123, 3271582279911, 9712201092643]

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

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