a(n) = K(n-1) + K(n) + K(n+1), where K(n) = A341711(floor(n/2)).

Terms

a(0) =2a(1) =7a(2) =11a(3) =29a(4) =43a(5) =97a(6) =137a(7) =283a(8) =389a(9) =749a(10) =1003a(11) =1839a(12) =2421a(13) =4259a(14) =5515a(15) =9391a(16) =12011a(17) =19887a(18) =25143a(19) =40665a(20) =50931a(21) =80679a(22) =100161a(23) =155847a(24) =192051a(25) =294047a(26) =359839a(27) =543127a(28) =660623a(29) =984239