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A027065
a(n) = A027052(n, 2n-9).
2
0, 2, 6, 20, 68, 230, 776, 2604, 8670, 28606, 93494, 302748, 971810, 3094486, 9782092, 30721056, 95919714, 297938906, 921183940, 2836545972, 8702745304, 26614653494, 81159163058, 246855070144, 749123740876, 2268700324802
OFFSET
5,2
LINKS
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-9), 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-9], {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-9) for n in (5..30)] # G. C. Greubel, Nov 06 2019
CROSSREFS
Sequence in context: A369123 A027063 A291005 * A231057 A295873 A006012
KEYWORD
nonn
STATUS
approved