A027066 a(n) = A027052(n, 2n-10).

1, 1, 3, 11, 37, 125, 423, 1429, 4811, 16111, 53589, 176905, 579407, 1882943, 6073469, 19452705, 61900375, 195799527, 615978629, 1928297807, 6009527345, 18653079889, 57686469763, 177812890843, 546456642501, 1674844848629

Offset

5,3

Links

G. C. Greubel, Table of n, a(n) for n = 5..750

Maple

T:= proc(n, k) option remember;
      if k<0 or k>2*n then 0
    elif k=0 or k=2 or k=2*n then 1
    elif k=1 then 0
    else add(T(n-1, k-j), j=1..3)
      fi
    end:
seq( T(n, 2*n-10), n=5..30); # G. C. Greubel, Nov 06 2019

Mathematica

T[n_, k_]:= T[n, k]= If[k<0 || k>2*n, 0, If[k==0 || k==2 || k==2*n, 1, If[k==1, 0, Sum[T[n-1, k-j], {j, 3}]]]]; Table[T[n, 2*n-10], {n, 5, 30}] (* G. C. Greubel, Nov 06 2019 *)

Prog

(Sage)
@CachedFunction
def T(n, k):
    if (k<0 or k>2*n): return 0
    elif (k==0 or k==2 or k==2*n): return 1
    elif (k==1): return 0
    else: return sum(T(n-1, k-j) for j in (1..3))
[T(n, 2*n-10) for n in (5..30)] # G. C. Greubel, Nov 06 2019

Crossrefs

Sequence in context: A263986 A192339 A027064 * A291415 A046722 A214996

Adjacent sequences: A027063 A027064 A027065 * A027067 A027068 A027069

Keyword

nonn

Author

Clark Kimberling

Status

approved