A094171 Number of quasi-tetrominoes in an n X n bounding box.

0, 0, 1, 20, 147, 670, 2239, 6138, 14531, 30904, 60369, 110300, 190671, 314910, 500247, 768810, 110300, 190671, 314910, 500247, 768810, 1147959, 1671648

Offset: 0

Author

Jon Wild, May 07 2004

Keywords

• nonn

Examples

			See A094170 for example of similar sequence.
		

Links

• Erich Friedman, Illustration of initial terms

Crossrefs

Cf. A094170, A094172.

Extensions

Corrected and extended by Jon Wild, May 11 2004