a(n) = (A048898(n)^2 + 1)/5^n, n >= 0.

Terms

a(0) =1a(1) =1a(2) =2a(3) =26a(4) =53a(5) =1354a(6) =13562a(7) =26858a(8) =200965a(9) =40193a(10) =3859882a(11) =13496122a(12) =62298370a(13) =12459674a(14) =4106065226a(15) =4044371993a(16) =69072101242a(17) =218014644394a(19) =627510050434