Column 1 of triangle A118045; also equals a bisection of A118034, which is column 1 of A118032.

A118047

Column 1 of triangle A118045; also equals a bisection of A118034, which is column 1 of A118032.

Terms

    a(0) =2a(1) =8a(2) =28a(3) =86a(4) =250a(5) =696a(6) =1824a(7) =4754a(8) =11562a(9) =28720a(10) =66318a(11) =159018a(12) =352462a(13) =820296a(14) =1758918a(15) =3985674a(16) =8301164a(17) =18387760a(18) =37363592a(19) =80821750a(20) =160486846a(21) =341134360a(22) =664796080a(23) =1382614158a(24) =2643480612a(25) =5427669252a(26) =10233128562a(27) =20595748670

External references