Coordination sequence for (3,3,4) tiling of hyperbolic plane.

Terms

a(0) =1a(1) =3a(2) =6a(3) =10a(4) =15a(5) =22a(6) =31a(7) =44a(8) =62a(9) =87a(10) =122a(11) =171a(12) =240a(13) =336a(14) =471a(15) =660a(16) =925a(17) =1296a(18) =1816a(19) =2545a(20) =3566a(21) =4997a(22) =7002a(23) =9812a(24) =13749a(25) =19266a(26) =26997a(27) =37830a(28) =53010a(29) =74281