|
|
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
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|