Number of free tetrakis polyaboloes (poly-[4.8^2]-tiles) with n cells, allowing holes, where division into tetrakis cells (triangular quarters of square grid cells) is significant.
A197465
Number of free tetrakis polyaboloes (poly-[4.8^2]-tiles) with n cells, allowing holes, where division into tetrakis cells (triangular quarters of square grid cells) is significant.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =6a(4) =8a(5) =22a(6) =42a(7) =112a(8) =252a(9) =650a(10) =1584a(11) =4091a(12) =10369a(13) =26938a(14) =69651a(15) =182116a(16) =476272a(17) =1253067a(18) =3302187a(19) =8733551a(20) =23142116a(21) =61477564a(22) =163612714a(23) =436278921a(24) =1165218495a(25) =3117021788a(26) =8349892686a(27) =22397754046a(28) =60153261611
External references
- oeis: A197465