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A251617 Number of tilings of a 5 X n rectangle using n pentominoes of shapes F, I, L, U. 3
1, 1, 3, 5, 19, 74, 219, 628, 1749, 5486, 17448, 53383, 160169, 479908, 1468366, 4512092, 13782535, 41855766, 127112554, 387469920, 1182800866, 3606789463, 10983721059, 33445214911, 101911804705, 310658892951, 946813182854, 2884825285301, 8789233684468 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

Wikipedia, Pentomino

EXAMPLE

a(4) = 19 = 13 + 4 + 2 = A249762(4) + 4 + 2:

._______.     ._______.

|_____. |     | ._____|

| | ._|_|     |_| ._. |

| | |_. |     | |_| |_|

| |___| |     |_____| |

|___|___| (4) |_______| (2) .

CROSSREFS

Cf. A174249, A233427, A247443, A247680, A249762, A251737.

Sequence in context: A181519 A265778 A257866 * A055452 A184254 A077458

Adjacent sequences:  A251614 A251615 A251616 * A251618 A251619 A251620

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Dec 05 2014

STATUS

approved

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Last modified October 30 05:44 EDT 2020. Contains 338077 sequences. (Running on oeis4.)