Number of vertices of type A at level n of the hyperbolic Pascal pyramid.

Terms

a(0) =0a(1) =0a(2) =3a(3) =6a(4) =12a(5) =27a(6) =66a(7) =168a(8) =435a(9) =1134a(10) =2964a(11) =7755a(12) =20298a(13) =53136a(14) =139107a(15) =364182a(16) =953436a(17) =2496123a(18) =6534930a(19) =17108664a(20) =44791059a(21) =117264510a(22) =307002468a(23) =803742891a(24) =2104226202a(25) =5508935712a(26) =14422580931a(27) =37758807078a(28) =98853840300a(29) =258802713819