login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A062155 Number of n-row matrices over {0,1,2} with all row and column sums equal to 1 or 2. 2
1, 3, 38, 1107, 58938, 5002470, 620355870, 105848185590, 23785613520480, 6809213491925040, 2419333087316808600, 1044664066287091958400, 538796052743780959419600, 327150260492074733413299600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, Wiley, N.Y., 1983,(Problem 3.4.15).

LINKS

Table of n, a(n) for n=0..13.

EXAMPLE

There are 38 2-row matrices over {0,1,2} with all row and column sums equal to 1 or 2: 1 of type 2 X 1, 13 of type 2 X 2, 18 of type 2 X 3 and 6 of type 2 X 4, cf. A062154.

CROSSREFS

Row sums of A062154, A062156.

Sequence in context: A158119 A263332 A335529 * A278927 A099022 A229365

Adjacent sequences:  A062152 A062153 A062154 * A062156 A062157 A062158

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic, Jun 06 2001

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 22 11:29 EDT 2020. Contains 337289 sequences. (Running on oeis4.)