Number of 4-ary rooted trees with n nodes and height at most 7.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =19a(7) =45a(8) =105a(9) =252a(10) =600a(11) =1435a(12) =3406a(13) =8076a(14) =19035a(15) =44749a(16) =104770a(17) =244642a(18) =569453a(19) =1322358a(20) =3062909a(21) =7079188a(22) =16326409a(23) =37579189a(24) =86331055a(25) =197972483a(26) =453188709a(27) =1035680593a(28) =2363000226a(29) =5382924016