Triangle, read by rows, of trinomial coefficients arranged so that there are n+1 terms in row n by setting T(n,k) equal to the coefficient of z^k in (1 + 3*z + z^2)^(n-[k/2]), for n>=k>=0, where [k/2] is the integer floor of k/2.
A099512
Triangle, read by rows, of trinomial coefficients arranged so that there are n+1 terms in row n by setting T(n,k) equal to the coefficient of z^k in (1 + 3*z + z^2)^(n-[k/2]), for n>=k>=0, where [k/2] is the integer floor of k/2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =6a(5) =1a(6) =1a(7) =9a(8) =11a(9) =6a(10) =1a(11) =12a(12) =30a(13) =45a(14) =1a(15) =1a(16) =15a(17) =58a(18) =144a(19) =30a(20) =9a(21) =1a(22) =18a(23) =95a(24) =330a(25) =195a(26) =144a(27) =1a(28) =1a(29) =21
External references
- oeis: A099512