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A251737 Number of tilings of a 5 X n rectangle using n pentominoes of shapes L, U, I. 3
1, 1, 3, 5, 17, 66, 181, 508, 1283, 3664, 10812, 31171, 88565, 245524, 692416, 1968532, 5609977, 15928174, 44982196, 127190716, 360208608, 1021611491, 2896270245, 8202605953, 23226285083, 65780006703, 186369631872, 528047092459, 1495905404102, 4237308534243 (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) = 17:

._______.     ._______.     ._______.     ._______.

|_____. |     | ._____|     | | | | |     | | ._| |

| | ._|_|     |_| ._. |     | | | | |     | | | | |

| | |_. |     | |_| |_|     | | | | |     | | | | |

| |___| |     |_____| |     | | | | |     | |_| | |

|___|___| (4) |_______| (2) |_|_|_|_| (1) |_|___|_| (2)

._______.     ._______.     ._______.

| ._| | |     | ._| ._|     | ._|_. |

| | | | |     | | | | |     | | | | |

| | | | |     | | | | |     | | | | |

|_| | | |     |_| |_| |     |_| | |_|

|___|_|_| (4) |___|___| (2) |___|___| (2) .

CROSSREFS

Cf. A174249, A233427, A247443, A247680, A249762, A251617.

Sequence in context: A278741 A265425 A256438 * A125957 A259908 A137460

Adjacent sequences:  A251734 A251735 A251736 * A251738 A251739 A251740

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Dec 07 2014

STATUS

approved

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Last modified November 23 16:18 EST 2020. Contains 338590 sequences. (Running on oeis4.)