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.

A062155 Number of n-row matrices over {0,1,2} with all row and column sums equal to 1 or 2.

Table of values

n a(n)
0 1
1 3
2 38
3 1107
4 58938
5 5002470
6 620355870
7 105848185590
8 23785613520480
9 6809213491925040
10 2419333087316808600
11 1044664066287091958400
12 538796052743780959419600
13 327150260492074733413299600
14 230994366606893955257329737600
15 187668642106165851767306588418000

List of values

[1, 3, 38, 1107, 58938, 5002470, 620355870, 105848185590, 23785613520480, 6809213491925040, 2419333087316808600, 1044664066287091958400, 538796052743780959419600, 327150260492074733413299600, 230994366606893955257329737600, 187668642106165851767306588418000]

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

Content is available under The OEIS End-User License Agreement.