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.

A250776 Number of (n+1)X(n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

Table of values

n a(n)
1 9
2 46
3 230
4 1152
5 5688
6 27986
7 137082
8 670608
9 3275574
10 15987988
11 77980390
12 380145754
13 1852275976
14 9021572492
15 43923360572
16 213777365336

List of values

[9, 46, 230, 1152, 5688, 27986, 137082, 670608, 3275574, 15987988, 77980390, 380145754, 1852275976, 9021572492, 43923360572, 213777365336]

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

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