Diagonally symmetric (about diagonal 2) 2n-celled polyominoes with 1 hole.
A057424
Diagonally symmetric (about diagonal 2) 2n-celled polyominoes with 1 hole.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =7a(4) =21a(5) =30a(6) =88a(7) =116a(8) =336a(9) =439a(10) =1271a(11) =1639a(12) =4713a(13) =6088a(14) =17452
External references
- oeis: A057424