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.

A250845 Number of (n+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)
1 100
2 2457
3 44797
4 626416
5 7134786
6 69543783
7 601566177
8 4741091128
9 34703305546
10 239290928999
11 1571038806045
12 9901650019496
13 60291096166330
14 356456047451631
15 2054525997174241
16 11582011158980816
17 64029681309724210
18 347906811859565887

List of values

[100, 2457, 44797, 626416, 7134786, 69543783, 601566177, 4741091128, 34703305546, 239290928999, 1571038806045, 9901650019496, 60291096166330, 356456047451631, 2054525997174241, 11582011158980816, 64029681309724210, 347906811859565887]