OFFSET
1,4
EXAMPLE
The a(144) = 17 factorizations:
(144),
(2*72), (3*48), (4*36), (6*24), (8*18), (9*16), (12*12),
(2*3*24), (2*4*18), (2*6*12), (2*8*9), (3*4*12), (3*6*8),
(2*2*6*6), (2*3*4*6), (3*3*4*4).
MATHEMATICA
facs[n_]:=If[n<=1, {{}}, Join@@Table[Map[Prepend[#, d]&, Select[facs[n/d], Min@@#>=d&]], {d, Rest[Divisors[n]]}]];
Table[Length[Select[facs[n], SameQ@@Length/@Split[#]&]], {n, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Sep 16 2018
STATUS
approved