a(n) = A139480(n)/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =7a(5) =8a(6) =14a(7) =29a(8) =43a(9) =52a(10) =62a(11) =259a(12) =302a(13) =638a(14) =1100a(15) =1139a(16) =1607a(17) =2125a(18) =2210a(19) =4843a(20) =4969a(21) =5605a(22) =9967a(23) =10849a(24) =11603a(25) =22247a(26) =43120a(27) =55250a(28) =66023a(29) =108044