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A091915 Maximum of even products of partitions of n. 1
0, 2, 2, 4, 6, 8, 12, 18, 24, 36, 54, 72, 108, 162, 216, 324, 486, 648, 972, 1458, 1944, 2916, 4374, 5832, 8748, 13122, 17496, 26244, 39366, 52488, 78732, 118098, 157464, 236196, 354294, 472392, 708588, 1062882, 1417176, 2125764, 3188646, 4251528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..42.

FORMULA

For n>6, a(n+3) = 3a(n) (conjectured). - Ralf Stephan, Dec 02 2004

EXAMPLE

The partitions of 5 are 5, 41, 32, 311, 221, 2111, 11111, with products 5, 4, 6, 3, 4, 2, 1 and the maximal even product is 6.

MATHEMATICA

first Needs["DiscreteMath`Combinatorica`"], then f[n_] := Max[ Select[ Apply[ Times, Partitions[n], 2], EvenQ[ # ] &]]; Table[ f[n], {n, 1, 42}] (* Robert G. Wilson v, Feb 12 2004 *)

Join[{0}, Table[Max[Select[Times@@@IntegerPartitions[n], EvenQ]], {n, 2, 50}]] (* Harvey P. Dale, Jan 17 2016 *)

CROSSREFS

Cf. A000792, A091916.

Sequence in context: A078578 A323446 A018129 * A123862 A089647 A274152

Adjacent sequences:  A091912 A091913 A091914 * A091916 A091917 A091918

KEYWORD

nonn

AUTHOR

Jon Perry, Feb 12 2004

EXTENSIONS

More terms from Robert G. Wilson v, Feb 12 2004

STATUS

approved

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Last modified November 27 06:33 EST 2020. Contains 338678 sequences. (Running on oeis4.)