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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.

A250690 Number of (n+1)X(7+1) 0..3 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 780551
2 3894542
3 19218493
4 92169818
5 420283865
6 1832718604
7 7662909389
8 30911828018
9 121133941641
10 463951270668
11 1745661462155
12 6479480240674
13 23806631357499
14 86830525247352
15 315154449951319
16 1140724783380058

List of values

[780551, 3894542, 19218493, 92169818, 420283865, 1832718604, 7662909389, 30911828018, 121133941641, 463951270668, 1745661462155, 6479480240674, 23806631357499, 86830525247352, 315154449951319, 1140724783380058]

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

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