login
A027034
a(n) = T(n,2n-10), T given by A027023.
2
1, 1, 5, 17, 57, 193, 653, 2205, 7417, 24805, 82373, 271437, 887377, 2878509, 9268429, 29636981, 94163769, 297435285, 934521973, 2922073641, 9096981049, 28209178729, 87163760797, 268462020889, 824451264113, 2525238433145
OFFSET
5,3
LINKS
MAPLE
T:= proc(n, k) option remember;
if k<3 or k=2*n then 1
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 05 2019
MATHEMATICA
T[n_, k_]:= T[n, k]= If[n<0, 0, If[k<3 || k==2*n, 1, Sum[T[n-1, k-j], {j, 3}]]]; Table[T[n, 2*n-10], {n, 5, 30}] (* G. C. Greubel, Nov 05 2019 *)
PROG
(Sage)
@CachedFunction
def T(n, k):
if (k<3 or k==2*n): return 1
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 05 2019
CROSSREFS
Sequence in context: A027093 A027032 A027095 * A027097 A098184 A289590
KEYWORD
nonn
STATUS
approved