Number of 4-ary rooted trees with n nodes and height at most 9.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =19a(7) =45a(8) =106a(9) =260a(10) =642a(11) =1614a(12) =4074a(13) =10356a(14) =26341a(15) =67093a(16) =170735a(17) =434149a(18) =1102279a(19) =2794856a(20) =7075440a(21) =17887216a(22) =45157381a(23) =113859010a(24) =286737286a(25) =721310274a(26) =1812628225a(27) =4550676482a(28) =11414249153a(29) =28605296518