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Search: id:A090014
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| A090014 |
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Permanent of (0,1)-matrix of size n X (n+d) with d=4 and n-1 zeros not on a line. |
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+0
1
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| 5, 25, 155, 1135, 9545, 90445, 952175, 11016595, 138864365, 1893369505, 27756952355, 435287980375, 7269934161905, 128812336516885, 2413131201408695, 47652865538001595, 989254278781162325
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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Brualdi, Richard A. and Ryser, Herbert J., Combinatorial Matrix Theory, Cambridge NY (1991), Chapter 7.
Seok-Zun Song et al., Extremes of permanents of (0,1)-matrices, Lin. Algebra and its Applic. 373 (2003), p. 197-210.
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FORMULA
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a(n) = (n+3)*a(n-1) + (n-2)*a(n-2), a(1)=5, a(2)=25
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CROSSREFS
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a(n) = A001909(n-1) + A001909(n), a(1)=5
Cf. A000255, A000153, A000261, A001909, A001910, A090010, A055790, A090012-A090016.
Sequence in context: A106565 A092166 A121112 this_sequence A097145 A085644 A137963
Adjacent sequences: A090011 A090012 A090013 this_sequence A090015 A090016 A090017
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KEYWORD
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nonn,easy
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AUTHOR
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Jaap Spies (j.spies(AT)hccnet.nl), Dec 13 2003
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EXTENSIONS
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Corrected by Jaap Spies (j.spies(AT)hccnet.nl), Jan 26 2004
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