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A359689
a(n) is the number of free polyiamonds of n cells with chessboard coloring.
2
2, 1, 2, 4, 8, 19, 48, 120, 320, 864, 2372, 6581, 18470, 52094, 147966, 421931, 1208214, 3470789, 10001186, 28892674, 83671476, 242823392, 706090582, 2056861981, 6001601254, 17538308071, 51323923796, 150389970179, 441211039118, 1295886198194, 3810209524640, 11214075937205, 33035791339150
OFFSET
1,1
LINKS
FORMULA
See link "Counting Polyiamonds".
CROSSREFS
Sequence in context: A325665 A325843 A024739 * A024959 A029728 A376989
KEYWORD
nonn
AUTHOR
John Mason, Jan 11 2023
EXTENSIONS
More terms from John Mason, Oct 28 2023
STATUS
approved