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A057416 Number of staircase polygons of area n with 3 (staircase polygon) holes on square lattice (not allowing rotations). 1
4, 30, 184, 894, 3885, 15386, 56956, 199620, 669702, 2166462, 6798186, 20786496, 62160079, 182336358, 525931258, 1494726848, 4192885357, 11625457180, 31899800729, 86717361496, 233754981005, 625311996048 (list; graph; refs; listen; history; text; internal format)
OFFSET
18,1
LINKS
I. Jensen, Table of n, a(n) for n = 18..89 (from link below)
I. Jensen, More terms
CROSSREFS
Sequence in context: A317567 A132849 A115867 * A089154 A113450 A344399
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 30 2000
STATUS
approved

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)