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A023836
Sum of exponents in prime-power factorization of C(4n,2n-2).
1
0, 3, 4, 6, 6, 8, 8, 11, 11, 12, 11, 14, 13, 16, 13, 17, 14, 18, 15, 19, 20, 21, 21, 23, 23, 22, 22, 24, 22, 27, 22, 29, 26, 28, 27, 31, 29, 31, 31, 31, 31, 32, 32, 35, 34, 35, 32, 39, 34, 37, 35, 38, 37, 40, 37, 41, 40, 42, 40, 43, 43, 44, 43, 46, 43, 45, 42, 46, 45, 48, 43, 50, 46, 48, 50, 50, 50
OFFSET
1,2
LINKS
MATHEMATICA
Join[{0}, Rest[Total[Last[Transpose[FactorInteger[#]]]]&/@(Binomial[ 4#, 2#-2]&/@Range[80])]] (* Harvey P. Dale, Jun 07 2011 *)
CROSSREFS
Sequence in context: A263842 A286956 A265283 * A064800 A078574 A347299
KEYWORD
nonn
STATUS
approved