Triangle of coefficients of generating function of 6-ary rooted trees of height at most n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =1a(13) =1a(14) =2a(15) =3a(16) =5a(17) =7a(18) =11a(19) =14a(20) =19a(21) =24a(22) =31a(23) =37a(24) =46a(25) =52a(26) =61a(27) =68a(28) =76a(29) =81