Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026648.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =11a(6) =17a(7) =30a(8) =47a(9) =86a(10) =133a(11) =242a(12) =375a(13) =679a(14) =1054a(15) =1914a(16) =2968a(17) =5389a(18) =8357a(19) =15166a(20) =23523a(21) =42698a(22) =66221a(23) =120204a(24) =186425a(25) =338381a(26) =524806a(27) =952592a(28) =1477398a(29) =2681683