Number of ways that a tile in the form of a strip of n congruent regular hexagons stuck together on successive parallel edges can be surrounded by one layer of copies of itself in a plane. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.
A159295
Number of ways that a tile in the form of a strip of n congruent regular hexagons stuck together on successive parallel edges can be surrounded by one layer of copies of itself in a plane. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.
Terms
- a(0) =1a(1) =747a(2) =1842a(3) =4025a(4) =7856a(5) =14124a(6) =23936a(7) =38654a(8) =60090a(9) =90407a(10) =132374a(11) =189223a(12) =264972a(13) =364230a(14) =492596a(15) =656404a(16) =863206a(17) =1121449a(18) =1441050a(19) =1832997a(20) =2310024a(21) =2886128a(22) =3577352a(23) =4401210a(24) =5377586a(25) =6528059a(26) =7876926a(27) =9450419a(28) =11277860
External references
- oeis: A159295