Number of vertices of type B at level n of the hyperbolic Pascal pyramid PP_(4,5).

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =12a(6) =33a(7) =88a(8) =232a(9) =609a(10) =1596a(11) =4180a(12) =10945a(13) =28656a(14) =75024a(15) =196417a(16) =514228a(17) =1346268a(18) =3524577a(19) =9227464a(20) =24157816a(21) =63245985a(22) =165580140a(23) =433494436a(24) =1134903169a(25) =2971215072a(26) =7778742048a(27) =20365011073a(28) =53316291172a(29) =139583862444