E.g.f.: (cosh(2*x) + sinh(2*x)*cosh(x)) / (cosh(x) - sinh(x)*cosh(2*x)).

A245140

E.g.f.: (cosh(2*x) + sinh(2*x)*cosh(x)) / (cosh(x) - sinh(x)*cosh(2*x)).

Terms

    a(0) =1a(1) =3a(2) =9a(3) =45a(4) =297a(5) =2433a(6) =23949a(7) =275145a(8) =3612177a(9) =53348193a(10) =875453589a(11) =15802999545a(12) =311196040857

External references