Layer counting sequence for hyperbolic tessellation by cuspidal triangles of angles (Pi/3, Pi/5, Pi/7).

A054887

Layer counting sequence for hyperbolic tessellation by cuspidal triangles of angles (Pi/3, Pi/5, Pi/7).

Terms

    a(0) =1a(1) =3a(2) =6a(3) =11a(4) =20a(5) =36a(6) =64a(7) =113a(8) =200a(9) =354a(10) =626a(11) =1107a(12) =1958a(13) =3464a(14) =6128a(15) =10839a(16) =19172a(17) =33913a(18) =59988a(19) =106111a(20) =187696a(21) =332009a(22) =587280a(23) =1038820a(24) =1837534a(25) =3250353a(26) =5749442a(27) =10169998a(28) =17989372a(29) =31820803

External references