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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.

A250857 Number of (5+1) X (n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Table of values

n a(n)
1 54410
2 291165
3 1043885
4 2955136
5 7134786
6 15344785
7 30214465
8 55486360
9 96292546
10 159461501
11 253855485
12 390738440
13 584174410
14 851456481
15 1213566241
16 1695663760
17 2327608090
18 3144508285
19 4187304941
20 5503382256
21 7147210610

List of values

[54410, 291165, 1043885, 2955136, 7134786, 15344785, 30214465, 55486360, 96292546, 159461501, 253855485, 390738440, 584174410, 851456481, 1213566241, 1695663760, 2327608090, 3144508285, 4187304941, 5503382256, 7147210610]

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

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