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A057413 Number of staircase polygons of perimeter 2n with any number of (staircase polygon) holes on square lattice (not allowing rotations). 1

%I

%S 1,2,5,14,42,132,430,1442,4956,17400,62251,226506,836911,3136182,

%T 11906908,45761338,177903128,699167112,2776219871,11132523840,

%U 45062497156,184057276510,758328417263,3150593560374,13195743501195

%N Number of staircase polygons of perimeter 2n with any number of (staircase polygon) holes on square lattice (not allowing rotations).

%H I. Jensen, <a href="/A057413/b057413.txt">Table of n, a(n) for n = 2..51</a>

%H I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/staircase.perim.allholes.ser">More terms</a>

%K nonn

%O 2,2

%A _N. J. A. Sloane_, Aug 30 2000

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Last modified February 20 01:06 EST 2018. Contains 299357 sequences. (Running on oeis4.)