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A251076 Number of tilings of a 21 X n rectangle using 3n heptominoes of shape I. 3
1, 1, 1, 1, 1, 1, 1, 53, 141, 271, 449, 681, 973, 1331, 9391, 26803, 60953, 122641, 226921, 394031, 650413, 2039288, 5611209, 13694084, 30417897, 62763334, 122046063, 225958222, 532867801, 1319078776, 3196149101, 7383041514, 16186545853, 33788903208 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,8

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..500

Wikipedia, Heptomino

CROSSREFS

Column k=7 of A251072.

Cf. A250664.

Sequence in context: A239721 A142259 A161611 * A142043 A175600 A142417

Adjacent sequences:  A251073 A251074 A251075 * A251077 A251078 A251079

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 29 2014

STATUS

approved

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Last modified September 20 02:19 EDT 2021. Contains 347577 sequences. (Running on oeis4.)