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A130866 Number of polyominoes (or square animals) with at most n cells. 1
1, 2, 4, 9, 21, 56, 164, 533, 1818, 6473, 23546, 87146, 325737, 1227708, 4654284, 17733539, 67841448, 260463500, 1003087732, 3873759682, 14996820360, 58188678048, 226235685776, 881235386179, 3438462430943, 13437551253018 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..25.

CROSSREFS

Partial sums of A000105.

Sequence in context: A006080 A287694 A148074 * A123458 A048194 A148075

Adjacent sequences:  A130863 A130864 A130865 * A130867 A130868 A130869

KEYWORD

nonn

AUTHOR

Tanya Khovanova, Jul 23 2007

STATUS

approved

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Last modified June 28 15:15 EDT 2017. Contains 288838 sequences.