[1,1,2,6,20,68,231,781,2629,8821,29530,98706, 329592,1099792,3668127,12230505,40771337, 135895689,452914658,1509385902,5029980252, 16761785436,55855539047,186125915029,620217261197, 2066704787645,6886704234970,22947920663130, 76467083518464]