Number of free polyominoes with checkerboard-pattern-colored vertices with n cells.

A361625

Number of free polyominoes with checkerboard-pattern-colored vertices with n cells.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =7a(4) =20a(5) =60a(6) =204a(7) =702a(8) =2526a(9) =9180a(10) =33989a(11) =126713a(12) =476597a(13) =1802109a(14) =6850969a(15) =26151529a(16) =100207548a(17) =385217382a(18) =1485216987a(19) =5741240989a(20) =22246000726a(21) =86383317470a(22) =336093551268

External references