OFFSET
3,3
LINKS
Gábor Czédli, Minimum-sized generating sets of the direct powers of the free distributive lattice on three generators and a Sperner theorem, arXiv:2309.13783 [math.CO], 2023. See formulas (3.5) at p. 4 and (4.15) at p. 8.
FORMULA
MATHEMATICA
q[n_]:=Ceiling[(n-3)/2]; a[n_]:=Sum[Binomial[n-3(i+1), q[n]-3i], {i, 0, Floor[q[n]/3]}]; Array[a, 37, 3]
PROG
(PARI) a(n) = my(q=ceil((n-3)/2)); sum(i=0, q\3, binomial(n-3*(i+1), q-3*i)); \\ Michel Marcus, Sep 30 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Stefano Spezia, Sep 29 2023
STATUS
approved