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A057414
Number of staircase polygons of area n with one (staircase polygon) hole on square lattice (not allowing rotations).
+0
2
1, 4, 18, 62, 205, 624, 1841, 5214, 14448, 39118, 104281, 273900, 711416, 1828950, 4663203, 11801056, 29677044, 74209404, 184655403, 457446252, 1128794669, 2775534900, 6802886782, 16625602146, 40524317635
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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