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1, 3, 12, 50, 212, 905, 3872, 16576, 70968, 303832, 1300737, 5568473, 23838453, 102051167, 436874885, 1870233780, 8006350999, 34274673894, 146727674181, 628131735844, 2688991567300, 11511399994065, 49279563214531
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..22.
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FORMULA
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a(n) = 9a(n-1)-28a(n-2)+38a(n-3)-20a(n-4)+a(n-5)
g.f.: -(1-6*x+13*x^2-12*x^3+4*x^4)/(-1+9*x-28*x^2+38*x^3-20*x^4+x^5)
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MATHEMATICA
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LinearRecurrence[{9, -28, 38, -20, 1}, {1, 3, 12, 50, 212}, 30] (* Harvey P. Dale, Apr 06 2013 *)
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CROSSREFS
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Cf. a(n)=A113439(4n+1).
Sequence in context: A037653 A092443 A108080 * A119976 A074547 A151178
Adjacent sequences: A113438 A113439 A113440 * A113442 A113443 A113444
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KEYWORD
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nonn
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AUTHOR
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Floor van Lamoen (fvlamoen(AT)hotmail.com), Nov 04 2005
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STATUS
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approved
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