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A247767 Number of tilings of a 5 X n rectangle using n pentominoes of any but the I shape. 2
1, 0, 4, 47, 394, 2082, 15113, 111664, 789930, 5388729, 37962036, 267900038, 1877701685, 13141471298, 92221485370, 647245199343, 4539199525168, 31832400653712, 223293082430497, 1566297779277274, 10986034079244754, 77056637214925187, 540492511401025908 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
Wikipedia, Pentomino
FORMULA
a(n) ~ c * d^n, where d = 7.01416750857825226506514643912781291412359726219671934675693027314..., c = 0.13222555150807010834232270820065757694578512718826743587412093176... . - Vaclav Kotesovec, Mar 05 2016
CROSSREFS
Column k=0 of A247703.
Sequence in context: A301278 A186677 A277654 * A278267 A309329 A354405
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved

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Last modified May 22 13:22 EDT 2024. Contains 372755 sequences. (Running on oeis4.)