a(n) is the number of free polyominoes with k cells and n-k distinguished vertices.
A343417
a(n) is the number of free polyominoes with k cells and n-k distinguished vertices.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =71a(6) =300a(7) =1370a(8) =6563a(9) =32272a(10) =161700a(11) =820166a(12) =4198764a(13) =21647353a(14) =112262033a(15) =585049063a(16) =3061951973a(17) =16084816384a(18) =84773694223
External references
- oeis: A343417