E.g.f.: 1/(5 - 4*cosh(x)).A249939E.g.f.: 1/(5 - 4*cosh(x)).Terms a(0) =1a(1) =4a(2) =100a(3) =6244a(4) =727780a(5) =136330084a(6) =37455423460External referencesoeis: A249939