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A020969
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Expansion of 1/((1-7x)(1-8x)(1-12x)).
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1, 27, 493, 7611, 107293, 1432011, 18457741, 232505307, 2883927805, 35398400235, 431393410669, 5231599117563, 63232056214237, 762504498009099, 9180490786688077, 110414131486397979, 1326988747136473789
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (27,-236,672).
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FORMULA
| a(n) = 27*a(n-1) - 236*a(n-2) + 672*a(n-3), n>=3. - Vincenzo Librandi, Mar 15 2011
a(n) = 20*a(n-1) - 96*a(n-2) + 7^n, a(0)=1, a(1)=27. - Vincenzo Librandi, Mar 15 2011
a(n) = (7^(n+2)-10*8^(n+1)+3*12^(n+1))/5 - Bruno Berselli, Mar 15 2011
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CROSSREFS
| Sequence in context: A020971 A023772 A020726 * A025956 A020724 A021994
Adjacent sequences: A020966 A020967 A020968 * A020970 A020971 A020972
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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