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Search: id:A122471
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| A122471 |
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a(n)=7*a(n-1)-n for n> 0, a(0)=1. |
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+0
1
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| 1, 6, 40, 277, 1935, 13540, 94774, 663411, 4643869, 32507074, 227549508, 1592846545, 11149925803, 78049480608, 546346364242, 3824424549679, 26770971847737, 187396802934142, 1311777620538976, 9182443343772813
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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From a quiz.
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REFERENCES
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K. Russell and P. Carter, Number Puzzles, W. Foulsham and Co. Ltd. (1993).
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FORMULA
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a(n)=36*[7+6*n+29*7^n], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Oct 01 2008]
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PROGRAM
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(PARI) a(n)=if(n>0, 7*a(n-1)-n, 1) for(n=0, 30, print1(a(n), ", "))
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CROSSREFS
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Sequence in context: A123357 A081016 A083426 this_sequence A090041 A069720 A005037
Adjacent sequences: A122468 A122469 A122470 this_sequence A122472 A122473 A122474
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KEYWORD
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nonn
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AUTHOR
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Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 14 2006
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