Column 2 of triangle A118040, which is the matrix square of triangle A118032; also equals a bisection of A118035, which is column 2 of A118032.
A118043
Column 2 of triangle A118040, which is the matrix square of triangle A118032; also equals a bisection of A118035, which is column 2 of A118032.
Terms
- a(0) =1a(1) =6a(2) =24a(3) =84a(4) =270a(5) =780a(6) =2268a(7) =5832a(8) =15876a(9) =37848a(10) =98058a(11) =221400a(12) =550644a(13) =1194096a(14) =2880324a(15) =6042600a(16) =14072928a(17) =28685316a(18) =65451120a(19) =130464594a(20) =288080334a(21) =560852526a(22) =1222435008a(23) =2344246554a(24) =4953629430a(25) =9307132992a(26) =19531257918
External references
- oeis: A118043