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A068920 Table of t(r,s) by diagonals, where t(r,s) is the number of ways to tile an r X s room with 1x2 Tatami mats. At most 3 Tatami mats may meet at a point. 13
0, 1, 1, 0, 2, 0, 1, 3, 3, 1, 0, 4, 0, 4, 0, 1, 6, 4, 4, 6, 1, 0, 9, 0, 2, 0, 9, 0, 1, 13, 6, 3, 3, 6, 13, 1, 0, 19, 0, 3, 0, 3, 0, 19, 0, 1, 28, 10, 3, 2, 2, 3, 10, 28, 1, 0, 41, 0, 5, 0, 2, 0, 5, 0, 41, 0, 1, 60, 16, 5, 2, 2, 2, 2, 5, 16, 60, 1, 0, 88, 0, 6, 0, 1, 0, 1, 0, 6, 0, 88, 0, 1, 129, 26 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table begins: t(1,1); t(1,2) t(2,1); t(1,3) t(2,2) t(3,1); ... Rows 2-6 are given in A068921 - A068925.

LINKS

Table of n, a(n) for n=1..94.

Dean Hickerson, Filling rectangular rooms with Tatami mats

MATHEMATICA

See link for Mathematica programs.

CROSSREFS

Cf. A068926 for incongruent tilings, A067925 for count by area, A068921 for row 2, A068922 for row 3, A068923 for row 4, A068924 for row 5, A068925 for row 6.

Sequence in context: A242379 A103438 A167279 * A099390 A124031 A241954

Adjacent sequences:  A068917 A068918 A068919 * A068921 A068922 A068923

KEYWORD

nonn,tabl

AUTHOR

Dean Hickerson, Mar 11 2002

STATUS

approved

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Last modified September 16 19:31 EDT 2014. Contains 246829 sequences.