0,13

The sprawl of a polyomino is the number of cells in a polyomino plus the number of cells adjacent to it.

Table of n, a(n) for n=0..33.

Sean A. Irvine, Java program (github)

Antidiagonal sums of A338211.

Cf. A000105, A338211, A338212.

Sequence in context: A039915 A085346 A121861 * A317736 A060006 A123097

Adjacent sequences: A338210 A338211 A338212 * A338214 A338215 A338216

nonn,more

Sean A. Irvine and Allan C. Wechsler, Oct 17 2020

approved