Row sums of triangle A099510, so that a(n) = Sum_{k=0..n} coefficient of z^k in (1 + 2*z + z^2)^(n-[k/2]), where [k/2] is the integer floor of k/2.
A099511
Row sums of triangle A099510, so that a(n) = Sum_{k=0..n} coefficient of z^k in (1 + 2*z + z^2)^(n-[k/2]), where [k/2] is the integer floor of k/2.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =17a(4) =45a(5) =116a(6) =305a(7) =799a(8) =2090a(9) =5473a(10) =14329a(11) =37512a(12) =98209a(13) =257115a(14) =673134a(15) =1762289a(16) =4613733a(17) =12078908a(18) =31622993a(19) =82790071a(20) =216747218a(21) =567451585a(22) =1485607537a(23) =3889371024a(24) =10182505537a(25) =26658145587a(26) =69791931222a(27) =182717648081a(28) =478361013021
External references
- oeis: A099511