Number of 4-ary rooted trees with n nodes and height at most 5.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =18a(7) =39a(8) =80a(9) =165a(10) =331a(11) =664a(12) =1307a(13) =2569a(14) =4983a(15) =9624a(16) =18416a(17) =35060a(18) =66218a(19) =124411a(20) =232138a(21) =430783a(22) =794431a(23) =1457063a(24) =2656709a(25) =4817940a(26) =8688296a(27) =15584381a(28) =27802598a(29) =49340196