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A137249
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Transform of A033999 by the T_{0,1} transformation (see link).
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0
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2, 2, 7, 15, 37, 84, 197, 456, 1062, 2467, 5737, 13335, 31002, 72069, 167542, 389486, 905447, 2104907, 4893317, 11375580, 26445017, 61477204, 142917162, 332242091, 772369157, 1795540447, 4174125122, 9703663625, 22558281082
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..29.
Richard Choulet, Curtz-like transformation.
Index to sequences with linear recurrences with constant coefficients, signature (2,1,-1,1).
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FORMULA
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The o.g.f is the function f given by f(z)=a(0)+a(1)*z+...=((2-2*z+z^2+z^3)/((1+z)*(1-3*z+2*z^2-z^3))). Recurrence formula : a(n+4)=2*a(n+3)+a(n+2)-a(n+1)+a(n)
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MATHEMATICA
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LinearRecurrence[{2, 1, -1, 1}, {2, 2, 7, 15}, 30] (* From Harvey P. Dale, Feb 02 2012 *)
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CROSSREFS
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Cf. A136302, A136303, A136304, A136305.
Sequence in context: A061274 A061575 A133602 * A216461 A192921 A051769
Adjacent sequences: A137246 A137247 A137248 * A137250 A137251 A137252
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KEYWORD
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easy,nonn
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AUTHOR
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Richard Choulet, Apr 05 2008
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STATUS
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approved
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