Number of free polyominoes in {4,5} tessellation of the hyperbolic plane.

A119611

Number of free polyominoes in {4,5} tessellation of the hyperbolic plane.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =16a(6) =55a(7) =224a(8) =978a(9) =4507a(10) =21430a(11) =104423a(12) =517897a(13) =2606185a(14) =13272978a(15) =68300918a(16) =354649465a(17) =1856271806a(18) =9785436128a(19) =51916467206a(20) =277045470555

External references