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A185179 Irregular triangle, read by rows, of the A185178(n) values of the permanent of an n X n (0,1)-matrix (n>=3) with exactly three 1's in each row and each column. 3
6, 9, 12, 13, 17, 18, 20, 36, 24, 25, 26, 27, 30, 31, 32, 54, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45, 48, 49, 52, 72, 78, 81 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

REFERENCES

V. I. Bolshakov, On spectrum of permanent on Lambda_n^k, Proc. of Seminar on Discrete Math. and Appl., Moscow State Univ. (1986), 65-73 (in Russian).

LINKS

Table of n, a(n) for n=3..36.

V. S. Shevelev, Some problems of the theory of enumerating the permutations with restricted position, Journal of Soviet Mathematics, 61 (4) (1992) 2272-2317 (see pp. 2307-2309).

EXAMPLE

Triangle begins:

6

9

12, 13

17, 18, 20, 36

24, 25, 26, 27, 30, 31, 32, 54,

33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45, 48, 49, 52, 72, 78, 81

CROSSREFS

Cf. A185178, A185177, A176211, A176212.

Sequence in context: A081392 A225868 A185177 * A072546 A295670 A272466

Adjacent sequences:  A185176 A185177 A185178 * A185180 A185181 A185182

KEYWORD

nonn,tabf,hard,more

AUTHOR

Vladimir Shevelev, Feb 19 2011

STATUS

approved

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Last modified May 27 04:17 EDT 2019. Contains 323597 sequences. (Running on oeis4.)