a(n) = (1+(A034939(n))^2)/5^n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =26a(4) =53a(5) =365a(6) =73a(7) =13369a(8) =31226a(9) =40193a(10) =1346393a(11) =10982633a(12) =59784881a(13) =12459674a(14) =197301737a(15) =4044371993a(16) =16335212753a(17) =165277755905a(18) =33055551181a(19) =627510050434