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A028247 Number of T-frame polyominoes with n cells. 0
1, 2, 6, 10, 19, 28, 44, 60, 86, 110, 146, 182, 233, 278, 343, 403, 490, 557, 664, 749, 879, 978, 1132, 1237, 1435, 1551, 1771, 1905 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

LINKS

Table of n, a(n) for n=4..31.

CROSSREFS

Sequence in context: A127567 A169643 A005993 * A209535 A065054 A128165

Adjacent sequences:  A028244 A028245 A028246 * A028248 A028249 A028250

KEYWORD

nonn

AUTHOR

Anne Fontaine (fonta(AT)hvcc.edu), Hudson Valley Community College, Troy NY 12180.

STATUS

approved

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Last modified February 18 05:48 EST 2018. Contains 299298 sequences. (Running on oeis4.)