Powers of sqrt(22) rounded down.

Terms

a(0) =1a(1) =4a(2) =22a(3) =103a(4) =484a(5) =2270a(6) =10648a(7) =49943a(8) =234256a(9) =1098758a(10) =5153632a(11) =24172676a(12) =113379904a(13) =531798888a(14) =2494357888a(15) =11699575548a(16) =54875873536a(17) =257390662067