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A283106 Number of distinct envelope areas of the polyominoes of order n. 0
1, 1, 1, 2, 2, 4, 5, 7, 9, 11, 12, 16, 18, 22, 26, 30, 33, 37, 41, 47, 52, 58, 62, 69, 74, 80, 86, 92, 97, 106, 112, 120, 127, 135, 143, 152, 159, 168, 176, 186, 193, 205, 213, 225, 235, 246, 256, 269, 281, 291, 302 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

The envelope of a polyomino is the minimal rectangle containing it.

LINKS

Table of n, a(n) for n=0..50.

EXAMPLE

a(3) = 2;

The two possible envelopes are

|*|

|*|

|*|    area = 3;

and

|*| |

|*|*|  area = 4.

CROSSREFS

Cf. A071764 (distinct envelope ratios).

Sequence in context: A058678 A241410 A324753 * A030769 A030739 A211861

Adjacent sequences:  A283103 A283104 A283105 * A283107 A283108 A283109

KEYWORD

nonn

AUTHOR

Francois Alcover, Feb 28 2017

STATUS

approved

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Last modified May 26 22:58 EDT 2020. Contains 334634 sequences. (Running on oeis4.)