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Search: id:A060928
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| A060928 |
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Expansion of 1/(1-5*x-4*x^3). |
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+0
3
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| 1, 5, 25, 129, 665, 3425, 17641, 90865, 468025, 2410689, 12416905, 63956625, 329425881, 1696797025, 8739811625, 45016761649, 231870996345, 1194314228225, 6151638187721, 31685674923985, 163205631532825
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,200
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FORMULA
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G.f.: 1/(1-5*x-4*x^3)
a(n)=5*a(n-1)+4*a(n-3), n >= 3; a(n)=5^n, n=0, 1, 2.
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PROGRAM
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(PARI) { for (n=0, 200, if (n>2, a=5*a1 + 4*a3; a3=a2; a2=a1; a1=a, if (n==0, a=a3=1, if (n==1, a=a2=5, a=a1=25))); write("b060928.txt", n, " ", a); ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 14 2009]
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CROSSREFS
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A060926, A060927.
Sequence in context: A081916 A082308 A026718 this_sequence A002002 A102893 A094602
Adjacent sequences: A060925 A060926 A060927 this_sequence A060929 A060930 A060931
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Apr 20 2001
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