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.

A140934 Number of 2 X 11 matrices with elements in 0..n with each row and each column in nondecreasing order. 2,11,n can be permuted, see formula.

Table of values

n a(n)
0 1
1 78
2 2366
3 41405
4 496860
5 4504864
6 32821152
7 200443464
8 1057896060
9 4936848280
10 20734762776
11 79483257308
12 281248448936
13 927192688800
14 2869882132000
15 8394405236100
16 23331508670925
17 61912369414350
18 157496378334750
19 385451662766625
20 910400117772600

List of values

[1, 78, 2366, 41405, 496860, 4504864, 32821152, 200443464, 1057896060, 4936848280, 20734762776, 79483257308, 281248448936, 927192688800, 2869882132000, 8394405236100, 23331508670925, 61912369414350, 157496378334750, 385451662766625, 910400117772600]

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

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