Powers of sqrt(23) rounded down.

Terms

a(0) =1a(1) =4a(2) =23a(3) =110a(4) =529a(5) =2536a(6) =12167a(7) =58350a(8) =279841a(9) =1342070a(10) =6436343a(11) =30867616a(12) =148035889a(13) =709955183a(14) =3404825447a(15) =16328969210a(16) =78310985281a(17) =375566291832