Row sums of triangle A099527, so that a(n) = Sum_{k=0..n} coefficient of z^k in (2 + 3*z + z^2)^(n-[k/2]), where [k/2] is the integer floor of k/2.
A099528
Row sums of triangle A099527, so that a(n) = Sum_{k=0..n} coefficient of z^k in (2 + 3*z + z^2)^(n-[k/2]), where [k/2] is the integer floor of k/2.
Terms
- a(0) =1a(1) =5a(2) =17a(3) =63a(4) =242a(5) =922a(6) =3502a(7) =13311a(8) =50608a(9) =192398a(10) =731429a(11) =2780649a(12) =10571120a(13) =40187929a(14) =152781292a(15) =580824261a(16) =2208102985a(17) =8394481949a(18) =31913061839a(19) =121322974122a(20) =461230079570
External references
- oeis: A099528