a(n) = (1/5)*A291389(n).

Terms

a(0) =2a(1) =17a(2) =130a(3) =940a(4) =6550a(5) =44475a(6) =296250a(7) =1944375a(8) =12612500a(9) =81035000a(10) =516537500a(11) =3270615625a(12) =20591031250a(13) =128998328125a(14) =804673593750