

A124745


Expansion of (1+x)/(1x^2+x^3).


13



1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, 16, 21, 28, 37, 49, 65, 86, 114, 151, 200, 265, 351, 465, 616, 816, 1081, 1432, 1897, 2513, 3329, 4410, 5842, 7739, 10252, 13581, 17991, 23833, 31572
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OFFSET

0,11


COMMENTS

Row sums of A124744.


LINKS

Table of n, a(n) for n=0..45.
Index entries for linear recurrences with constant coefficients, signature (0, 1, 1).


FORMULA

a(n) = Sum_{k=0..n} C(floor(k/2),nk)*(1)^(nk) = (1)^n*A078027(n).
a(n) = a(n2)  a(n3) with a(1) = a(2) = a(3) = 1.  Taras Goy, Mar 24 2019


CROSSREFS

The following are basically all variants of the same sequence: A000931, A078027, A096231, A124745, A133034, A134816, A164001, A182097, A228361 and probably A020720. However, each one has its own special features and deserves its own entry.
Sequence in context: A274200 A018052 A018124 * A133034 A000931 A078027
Adjacent sequences: A124742 A124743 A124744 * A124746 A124747 A124748


KEYWORD

easy,sign


AUTHOR

Paul Barry, Nov 06 2006


STATUS

approved



