OFFSET
1,2
LINKS
Álvar Ibeas, Table of n, a(n) for n = 1..40
FORMULA
EXAMPLE
a(3) = 1093 = 1 * 1 + 91 * 2 + 910 * 1, counting:
the unrefined chain 0 < (F_9)^3;
91 chains 0 < V < (F_9)^3, with dim(V) = 1; another
91 chains 0 < V < (F_9)^3, with dim(V) = 2; and
910 chains 0 < V_1 < V_2 < (F_9)^3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Álvar Ibeas, Sep 15 2021
STATUS
approved