a(2n+2) = 6*a(2n+1), a(2n+1) = 6*a(2n) - 5^n*A000108(n), a(0)=1.

A156195

a(2n+2) = 6*a(2n+1), a(2n+1) = 6*a(2n) - 5^n*A000108(n), a(0)=1.

Terms

    a(0) =1a(1) =5a(2) =30a(3) =175a(4) =1050a(5) =6250a(6) =37500a(7) =224375a(8) =1346250a(9) =8068750a(10) =48412500a(11) =290343750a(12) =1742062500a(13) =10450312500a(14) =62701875000a(15) =376177734375

External references