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Search: id:A103642
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| A103642 |
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Number of tilings of the Aztec dungeon E_n. |
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+0
1
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| 1, 26, 2197, 371293, 1631461442, 23298085122481, 665416609183179841, 494129058146900785408826, 1192533292512492016559195008117, 5756130429098929077956071497934208653
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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M. Ciucu, Perfect matchings and perfect powers
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FORMULA
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Recurrence: a(n+6) = 13^(4n+16)*a(n), starting with 1, 2*13, 13^3, 13^5, 2*13^8, 13^12.
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PROGRAM
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(PARI) a(n)=if(n<1, n==0, if(n<6, [2*13, 13^3, 13^5, 2*13^8, 13^12][n], 13^(4*n-8)*a(n-6)))
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CROSSREFS
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Sequence in context: A054597 A005643 A054853 this_sequence A087616 A058449 A034244
Adjacent sequences: A103639 A103640 A103641 this_sequence A103643 A103644 A103645
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KEYWORD
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nonn
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AUTHOR
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Ralf Stephan (ralf(AT)ark.in-berlin.de), Feb 19 2005
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