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A103642
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Number of tilings of the Aztec dungeon E_n.
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0
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1, 26, 2197, 371293, 1631461442, 23298085122481, 665416609183179841, 494129058146900785408826, 1192533292512492016559195008117, 5756130429098929077956071497934208653
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| M. Ciucu, Perfect matchings and perfect powers
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FORMULA
| 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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PROG
| (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
| Sequence in context: A206390 A173949 A173955 * A201623 A087616 A177636
Adjacent sequences: A103639 A103640 A103641 * A103643 A103644 A103645
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KEYWORD
| nonn
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AUTHOR
| Ralf Stephan (ralf(AT)ark.in-berlin.de), Feb 19 2005
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