OFFSET
1,2
LINKS
Álvar Ibeas, Table of n, a(n) for n = 1..40
FORMULA
EXAMPLE
a(3) = 148 = 1 * 1 + 21 * 2 + 105 * 1, counting:
the unrefined chain 0 < (F_4)^3;
21 chains 0 < V < (F_4)^3, with dim(V) = 1; another
21 chains 0 < V < (F_4)^3, with dim(V) = 2; and
105 chains 0 < V_1 < V_2 < (F_4)^3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Álvar Ibeas, Sep 15 2021
STATUS
approved