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A185179
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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.
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1
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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
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OFFSET
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3,1
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REFERENCES
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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).
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LINKS
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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).
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EXAMPLE
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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
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CROSSREFS
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Cf. A185178, A185177, A176211, A176212.
Sequence in context: A081392 A225868 A185177 * A072546 A189728 A214777
Adjacent sequences: A185176 A185177 A185178 * A185180 A185181 A185182
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KEYWORD
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nonn,tabf,hard,more
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AUTHOR
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Vladimir Shevelev, Feb 19 2011
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STATUS
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approved
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