VOOZH about

URL: https://oeis.org/A075156

⇱ A075156 - OEIS

login
A075156
Binomial transform of pentanacci numbers A074048: a(n) = Sum_{k=0..n} binomial(n,k)*A074048(k).
0
5, 6, 10, 24, 70, 216, 664, 2008, 5998, 17808, 52770, 156360, 463492, 1374392, 4076222, 12090144, 35859742, 106359928, 315460168, 935639768, 2775057510, 8230670416, 24411730298, 72403913480, 214746249796, 636926269816
OFFSET
0,1
FORMULA
a(n) = 6a(n-1) - 13a(n-2) + 14a(n-3) - 7a(n-4) + 2a(n-5), a(0)=5, a(1)=6, a(2)=10, a(3)=24, a(4)=70.
G.f.: (5 - 24*x + 39*x^2 - 28*x^3 + 7*x^4)/(1 - 6*x + 13*x^2 - 14*x^3 + 7*x^4 - 2*x^5).
a(n) = term (1,5) in the 1 X 5 matrix [70,24,10,6,5]. [6,1,0,0,0; -13,0,1,0,0; 14,0,0,1,0; -7,0,0,0,1; 2,0,0,0,0]^n. - Alois P. Heinz, Jul 25 2008
MAPLE
M := Matrix(5, (i, j)-> if (i=j-1) then 1 elif j>1 then 0 else [6, -13, 14, -7, 2][i] fi); a := n -> (Matrix([[70, 24, 10, 6, 5]]).M^(n))[1, 5]; seq (a(n), n=0..50); # Alois P. Heinz, Jul 25 2008
MATHEMATICA
CoefficientList[Series[(5-24*x+39*x^2-28*x^3+7*x^4)/(1-6*x+13*x^2-14*x^3+7*x^4-2*x^5), {x, 0, 25}], x]
LinearRecurrence[{6, -13, 14, -7, 2}, {5, 6, 10, 24, 70}, 30] (* Harvey P. Dale, Mar 10 2019 *)
CROSSREFS
Cf. A074048.
Sequence in context: A056050 A035111 A035282 * A075904 A018834 A029943
KEYWORD
easy,nonn
AUTHOR
Mario Catalani (mario.catalani(AT)unito.it), Sep 07 2002
STATUS
approved