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A219994 Number of tilings of an n X n square using dominoes and right trominoes. 6
1, 0, 2, 8, 380, 21272, 5350806, 3238675344, 6652506271144, 38896105985522272, 711716770252031164458, 38776997923112110535353528, 6460929292946758939597712150496, 3245656750963660788826395580466708824, 4953412325525289651086730443567098343730966, 22873302288206466754758793232467436030071524731072 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..17

EXAMPLE

a(3) = 8, because there are 8 tilings of a 3 X 3 square using dominoes and right trominoes:

  .___._.   .___._.   .___._.   .___._.

  |___| |   |___| |   |___| |   |_. | |

  | ._|_|   | | |_|   | |___|   | |_|_|

  |_|___|   |_|___|   |_|___|   |_|___|

  ._.___.   ._.___.   ._.___.   ._.___.

  | |___|   | | ._|   | |___|   | |___|

  |___| |   |_|_| |   |_|_. |   |_| | |

  |___|_|   |___|_|   |___|_|   |___|_|  .

CROSSREFS

Main diagonal of A219987.

Cf. A233807.

Sequence in context: A009836 A012342 A012348 * A014185 A009808 A035129

Adjacent sequences:  A219991 A219992 A219993 * A219995 A219996 A219997

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Dec 02 2012

STATUS

approved

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Last modified October 2 08:34 EDT 2022. Contains 357191 sequences. (Running on oeis4.)