Coordination sequence for (2,3,9) tiling of hyperbolic plane.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =12a(6) =16a(7) =21a(8) =28a(9) =36a(10) =45a(11) =56a(12) =70a(13) =89a(14) =113a(15) =143a(16) =181a(17) =228a(18) =287a(19) =361a(20) =455a(21) =575a(22) =726a(23) =916a(24) =1155a(25) =1456a(26) =1836a(27) =2315a(28) =2920a(29) =3684