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A174585 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-P^3) with exactly one 1 and one 2 in every row and column 0
0, 2, 132, 9800, 1309928 (list; graph; refs; listen; history; text; internal format)
OFFSET
5,2
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
CROSSREFS
Sequence in context: A131931 A020524 A157071 * A186194 A099682 A214436
KEYWORD
nonn,uned
AUTHOR
Vladimir Shevelev, Mar 23 2010
STATUS
approved

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Last modified June 21 03:54 EDT 2024. Contains 373540 sequences. (Running on oeis4.)