Layer counting sequence for hyperbolic tessellation by cuspidal triangles of angles (Pi/3,Pi/3,0) (this is the classical modular tessellation).

A054886

Layer counting sequence for hyperbolic tessellation by cuspidal triangles of angles (Pi/3,Pi/3,0) (this is the classical modular tessellation).

Terms

    a(0) =1a(1) =3a(2) =6a(3) =10a(4) =16a(5) =26a(6) =42a(7) =68a(8) =110a(9) =178a(10) =288a(11) =466a(12) =754a(13) =1220a(14) =1974a(15) =3194a(16) =5168a(17) =8362a(18) =13530a(19) =21892a(20) =35422a(21) =57314a(22) =92736a(23) =150050a(24) =242786a(25) =392836a(26) =635622a(27) =1028458a(28) =1664080a(29) =2692538

External references