Eighth column of triangle A055249.

Terms

a(0) =1a(1) =10a(2) =57a(3) =244a(4) =874a(5) =2772a(6) =8054a(7) =21920a(8) =56751a(9) =141326a(10) =341303a(11) =804276a(12) =1858080a(13) =4223784a(14) =9474444a(15) =21018144a(16) =46195149a(17) =100734354a(18) =218190469a(19) =469866964a(20) =1006759110a(21) =2147634364a(22) =4563581746a(23) =9663887808a(24) =20401343003a(25) =42949963286a(26) =90194651043a(27) =188978952404