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.

A250799 Number of (2+1) X (n+1) 0..1 arrays with nondecreasing min(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 24
2 66
3 162
4 376
5 838
6 1818
7 3868
8 8114
9 16842
10 34680
11 70974
12 144562
13 293356
14 593562
15 1198210
16 2414360
17 4857750
18 9762474
19 19600956
20 39324898
21 78848794
22 158019576
23 316560142
24 633963266
25 1269290508
26 2540787978
27 5085146898
28 10176071704

List of values

[24, 66, 162, 376, 838, 1818, 3868, 8114, 16842, 34680, 70974, 144562, 293356, 593562, 1198210, 2414360, 4857750, 9762474, 19600956, 39324898, 78848794, 158019576, 316560142, 633963266, 1269290508, 2540787978, 5085146898, 10176071704]

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

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