Column 1 of triangle A118040, which is the matrix square of triangle A118032; also equals a bisection of A118034, which is column 1 of A118032.

A118042

Column 1 of triangle A118040, which is the matrix square of triangle A118032; also equals a bisection of A118034, which is column 1 of A118032.

Terms

    a(0) =1a(1) =4a(2) =14a(3) =44a(4) =130a(5) =364a(6) =990a(7) =2540a(8) =6514a(9) =15640a(10) =38434a(11) =87940a(12) =209166a(13) =460224a(14) =1063818a(15) =2266576a(16) =5105788a(17) =10573476a(18) =23296326a(19) =47097284a(20) =101395460a(21) =200414252a(22) =424162586a(23) =823203108a(24) =1705499044a(25) =3248816636a(26) =6647515550a(27) =12492112904

External references