589251domain: NAppears in sequencesNumber of vertices of type B at level n of the hyperbolic Pascal pyramid.at n=15A292291Stationary differences in A342447: a(n) = A342447(2k-n+1,k)-A342447(2k-n,k) which does not depend on k if k>= 2n-2 (for n>0).at n=9A376894