%I A057414
%S A057414 1,4,18,62,205,624,1841,5214,14448,39118,104281,273900,711416,
%T A057414 1828950,4663203,11801056,29677044,74209404,184655403,457446252,
%U A057414 1128794669,2775534900,6802886782,16625602146,40524317635
%N A057414 Number of staircase polygons of area n with one (staircase polygon) hole 
               on square lattice (not allowing rotations).
%H A057414 I. Jensen, <a href="b057414.txt">Table of n, a(n) for n = 8..113</a> 
               (from link below)
%H A057414 I. Jensen, <a href="http://www.ms.unimelb.edu.au/~iwan/polygons/series/
               staircase.area.1hole.ser">More terms</a>
%Y A057414 Sequence in context: A119044 A058851 A073373 this_sequence A165910 A100177 
               A083321
%Y A057414 Adjacent sequences: A057411 A057412 A057413 this_sequence A057415 A057416 
               A057417
%K A057414 nonn
%O A057414 8,2
%A A057414 N. J. A. Sloane (njas(AT)research.att.com), Aug 30 2000