OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (2, 4).
FORMULA
Binomial transform of A133632, assuming offset zero there.
Inverse binomial transform of A048875.
G.f.: (1+3*x)/(1-2*x-4*x^2). - Vladimir Kruchinin, May 06 2011
EXAMPLE
a(3) = 48 = sum of row 3 terms of triangle A134417: (1 + 12 + 15 + 20).
PROG
(PARI) Vec((1+3*x)/(1-2*x-4*x^2) + O(x^31)) \\ Andrew Howroyd, Sep 21 2025
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Oct 24 2007
EXTENSIONS
Offset changed and a(14) onwards from Andrew Howroyd, Sep 21 2025
STATUS
approved