login
A198896
Number of Cohen-Macaulay modules (see Clark et al. for precise definition).
0
1, 2, 5, 12, 26, 54, 114, 228, 449, 878, 1690
OFFSET
0,2
REFERENCES
Sean Clark, Anton Preslicka, Josh Schwartz and Radoslav Zlatev, Some combinatorial conjectures on a family of toric ideals: A report from the MSRI 2011 Commutative Algebra graduate workshop.
FORMULA
a(n) = Sum_{i=0..n} b(i)b(n-i), where b(i) = A007323(i) (with b(0)=1).
CROSSREFS
Sequence in context: A026622 A297618 A360785 * A026688 A116726 A228078
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 31 2011
STATUS
approved