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.

A250538 Number of (n+1)X(2+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.

Table of values

n a(n)
1 1080
2 10704
3 79366
4 491650
5 2701872
6 13657024
7 64993652
8 295871112
9 1302924116
10 5595784456
11 23580939154
12 97951328382
13 402468021792
14 1640200686104
15 6643744925312
16 26790344223060
17 107678819237476
18 431796331093984

List of values

[1080, 10704, 79366, 491650, 2701872, 13657024, 64993652, 295871112, 1302924116, 5595784456, 23580939154, 97951328382, 402468021792, 1640200686104, 6643744925312, 26790344223060, 107678819237476, 431796331093984]

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

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