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A020971
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Expansion of 1/((1-7x)(1-9x)(1-11x)).
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1
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1, 27, 490, 7470, 103291, 1343097, 16753780, 202932540, 2405791381, 28065859767, 323426323870, 3691983687210, 41834308968271, 471276683342037, 5284615302054760, 59040661951743480, 657669557062017961
(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,-239,693).
Vincenzo Librandi, Table of n, a(n) for n = 0..133
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FORMULA
| a(n) = 27*a(n-1) - 239*a(n-2) + 693*a(n-3), n>=3. - Vincenzo Librandi, Mar 15 2011
a(n) = 20*a(n-1) - 99*a(n-2) + 7^n, a(0)=1, a(1)=27. - Vincenzo Librandi, Mar 15 2011
a(n) = (7^(n+2)-2*9^(n+2)+11^(n+2))/8 - Bruno Berselli, Mar 15 2011
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CROSSREFS
| Sequence in context: A025982 A042408 A023946 * A023772 A020726 A020969
Adjacent sequences: A020968 A020969 A020970 * A020972 A020973 A020974
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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