Least positive number missing from row n of Stern's diatomic array (see A049456 or A002487).

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =6a(5) =14a(6) =20a(7) =28a(8) =38a(9) =54a(10) =90a(11) =150a(12) =216a(13) =350a(14) =506a(15) =876a(16) =1230a(17) =2034a(18) =3160a(19) =4470a(20) =7764a(21) =12190a(22) =18816a(23) =29952a(24) =43800a(25) =73968a(26) =112602a(27) =182210a(28) =285780a(29) =474558