Column 1 of triangle A117418; also row sums of triangle A117418; also column 0 of the matrix square of triangle A117418.
A117419
Column 1 of triangle A117418; also row sums of triangle A117418; also column 0 of the matrix square of triangle A117418.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =9a(4) =23a(5) =66a(6) =209a(7) =724a(8) =2722a(9) =11054a(10) =48221a(11) =224549a(12) =1109099a(13) =5778542a(14) =31599830a(15) =180605495a(16) =1074867618a(17) =6641877098a(18) =42500291654a(19) =280917956734
External references
- oeis: A117419