Column 2 of triangle A118045; also equals a bisection of A118035, which is column 2 of A118032.

A118048

Column 2 of triangle A118045; also equals a bisection of A118035, which is column 2 of A118032.

Terms

    a(0) =3a(1) =15a(2) =57a(3) =192a(4) =567a(5) =1683a(6) =4392a(7) =12084a(8) =29073a(9) =75753a(10) =172269a(11) =430248a(12) =938784a(13) =2272308a(14) =4793652a(15) =11202642a(16) =22952439a(17) =52535655a(18) =105206253a(19) =233047158a(20) =455660913a(21) =996014343a(22) =1917372474a(23) =4062940566a(24) =7660442568a(25) =16114463106

External references