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A103641
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Number of tilings of the Aztec dungeon D_n.
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0
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1, 2, 13, 2197, 742586, 815730721, 23298085122481, 1330833218366359682, 247064529073450392704413, 1192533292512492016559195008117, 11512260858197858155912142995868417306
(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+12)*a(n), starting with 1, 2, 13, 13^3, 2*13^5, 13^8.
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PROG
| (PARI) a(n)=if(n<1, n==0, if(n<6, [2, 13, 13^3, 2*13^5, 13^8][n], 13^(4*n-12)*a(n-6)))
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CROSSREFS
| Sequence in context: A004071 A174363 A158026 * A144983 A110820 A139519
Adjacent sequences: A103638 A103639 A103640 * A103642 A103643 A103644
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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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