A049540 Number of n-ominoes for a high-dimensional orthoplex.

1, 1, 1, 3, 5, 17, 55, 267, 1467, 10371

Offset: 1

Author

Robert A. Russell

Keywords

• hard
• more
• nice
• nonn

Comments

An orthoplex polyomino does not extend more than two units along any axis.

Examples

			There are a(5)=5 orthoplex pentominoes: the two 3-D pentominoes that fit in a 2 X 2 X 2 box and the three 4-D pentominoes.
		

Crossrefs

A005519 counts a superset.