Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026907.

Terms

a(0) =1a(1) =13a(2) =41a(3) =90a(4) =185a(5) =335a(6) =601a(7) =1020a(8) =1729a(9) =2857a(10) =4721a(11) =7710a(12) =12593a(13) =20459a(14) =33241a(15) =53880a(16) =87337a(17) =141421a(18) =229001a(19) =370650a(20) =599921a(21) =970823a(22) =1571041a(23) =2542140a(24) =4113505a(25) =6655945a(26) =10769801a(27) =17426070a(28) =28196249a(29) =45622667