a(n) = A027941(n) + A027941(n+6).

Terms

a(0) =232a(1) =610a(2) =1600a(3) =4192a(4) =10978a(5) =28744a(6) =75256a(7) =197026a(8) =515824a(9) =1350448a(10) =3535522a(11) =9256120a(12) =24232840a(13) =63442402a(14) =166094368a(15) =434840704a(16) =1138427746a(17) =2980442536a(18) =7802899864a(19) =20428257058a(20) =53481871312a(21) =140017356880a(22) =366570199330a(23) =959693241112