Second bisection of A153382.

Terms

a(0) =8a(1) =18a(2) =48a(3) =128a(4) =338a(5) =888a(6) =2328a(7) =6098a(8) =15968a(9) =41808a(10) =109458a(11) =286568a(12) =750248a(13) =1964178a(14) =5142288a(15) =13462688a(16) =35245778a(17) =92274648a(18) =241578168a(19) =632459858a(20) =1655801408a(21) =4334944368a(22) =11349031698a(23) =29712150728a(24) =77787420488a(25) =203650110738a(26) =533162911728