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A283109
Increase in the number of free polyominoes from order n to n+1.
1
0, 0, 1, 3, 7, 23, 73, 261, 916, 3370, 12418, 46527, 174991, 663380, 2524605, 9652679, 37028654, 142514143, 550002180, 2128047718, 8252388728, 32068797010, 124855150040, 486952692675, 1902227344361, 7441861777311, 29153922116412, 114358089656116
OFFSET
0,4
LINKS
FORMULA
a(n) = A000105(n+1) - A000105(n).
CROSSREFS
Cf. A000105.
Sequence in context: A228724 A191638 A148704 * A339284 A057184 A148705
KEYWORD
nonn
AUTHOR
Francois Alcover, Feb 28 2017
STATUS
approved