5th-largest term in the n-th row of Stern's diatomic triangle A002487.

Terms

a(0) =1a(1) =3a(2) =9a(3) =16a(4) =27a(5) =46a(6) =76a(7) =123a(8) =207a(9) =335a(10) =545a(11) =882a(12) =1428a(13) =2311a(14) =3740a(15) =6051a(16) =9791a(17) =15842a(18) =25633a(19) =41475a(20) =67108a(21) =108583a(22) =175691a(23) =284274a(24) =459965a(25) =744239a(26) =1204204a(27) =1948443a(28) =3152647a(29) =5101090