login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A251073 Number of tilings of a 9 X n rectangle using 3n trominoes of shape I. 3
1, 1, 1, 19, 57, 121, 783, 2861, 8133, 37160, 143419, 468816, 1876855, 7263468, 25496863, 97187247, 372086645, 1352780401, 5071962134, 19220628318, 71025008365, 265095817718, 997839772024, 3713274525679, 13851695644227, 51940567251136, 193830054345968 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Alois P. Heinz, G.f. and Maple program for A251073

Wikipedia, Tromino

FORMULA

G.f.: see link above.

MAPLE

# see link above.

CROSSREFS

Column k=3 of A251072.

Cf. A236577.

Sequence in context: A126373 A125818 A093362 * A176413 A263336 A061973

Adjacent sequences:  A251070 A251071 A251072 * A251074 A251075 A251076

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 29 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 08:47 EDT 2019. Contains 328292 sequences. (Running on oeis4.)