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A094171 Number of quasi-tetrominoes in an n X n bounding box. 4
0, 0, 1, 20, 147, 670, 2239, 6138, 14531, 30904, 60369, 110300, 190671, 314910, 500247, 768810, 110300, 190671, 314910, 500247, 768810, 1147959, 1671648 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..22.

Erich Friedman, Illustration of initial terms

EXAMPLE

See A094170 for example of similar sequence.

CROSSREFS

Cf. A094170, A094172.

Sequence in context: A190067 A238021 A183959 * A100190 A189494 A022680

Adjacent sequences:  A094168 A094169 A094170 * A094172 A094173 A094174

KEYWORD

nonn

AUTHOR

Jon Wild, May 07 2004

EXTENSIONS

Corrected and extended by Jon Wild, May 11 2004

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)