login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A174582 Let J_n be n X n matrix which contains 1's only, I=I_n be the n X n identity matrix and P=P_n be the incidence matrix of the cycle (1,2,3,...,n). Then a(n) is the number of (0,1,2) n X n matrices A<=2(J_n-I-P-P^2) with exactly one 1 and one 2 in every row and column 2
0, 2, 72, 3722, 329192, 32842446 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

REFERENCES

V. S. Shevelev, Development of the rook technique for calculating the cyclic indicators of (0,1)-matrices, Izvestia Vuzov of the North-Caucasus region, Nature sciences 4 (1996), 21-28 (in Russian).

S. E. Grigorchuk, V. S. Shevelev, An algorithm of computing the cyclic indicator of couples discordant permutations with restricted position, Izvestia Vuzov of the North-Caucasus region, Nature sciences 3 (1997), 5-13 (in Russian).

LINKS

Table of n, a(n) for n=4..9.

CROSSREFS

A001499 A007107 A082491 A000186 A174564 A174580 A174581

Sequence in context: A179957 A221549 A289197 * A253316 A051443 A246486

Adjacent sequences:  A174579 A174580 A174581 * A174583 A174584 A174585

KEYWORD

nonn,uned

AUTHOR

Vladimir Shevelev, Mar 23 2010

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 February 21 16:08 EST 2019. Contains 320375 sequences. (Running on oeis4.)