login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A240214 Number of partitions p of n such that median(p) = multiplicity(min(p)). 5

%I #5 Apr 12 2014 16:24:20

%S 0,1,0,0,1,0,0,1,3,4,5,5,8,9,13,15,21,24,36,41,57,71,90,108,142,167,

%T 210,254,315,373,466,552,682,810,985,1173,1429,1683,2030,2404,2882,

%U 3390,4049,4755,5651,6630,7827,9157,10798,12593,14788,17224,20154,23420

%N Number of partitions p of n such that median(p) = multiplicity(min(p)).

%F a(n) = A240213(n) - A240212(n) for n >= 0.

%F a(n) + A240212(n) + A240215(n) = A000041(n) for n >= 0.

%e a(6) counts these 3 partitions: 422, 3311, 22211.

%t z = 40; f[n_] := f[n] = IntegerPartitions[n]; t1 = Table[Count[f[n], p_ /; Median[p] < Count[p, Min[p]]], {n, 0, z}] (* A240212 *)

%t t2 = Table[Count[f[n], p_ /; Median[p] <= Count[p, Min[p]]], {n, 0, z}] (* A240213 *)

%t t3 = Table[Count[f[n], p_ /; Median[p] == Count[p, Min[p]]], {n, 0, z}] (* A240214 *)

%t t4 = Table[Count[f[n], p_ /; Median[p] > Count[p, Min[p]]], {n, 0, z}] (* A240215 *)

%t t5 = Table[Count[f[n], p_ /; Median[p] >= Count[p, Min[p]]], {n, 0, z}] (* A240216 *)

%Y Cf. A240212, A240213, A240215, A240216, A000041.

%K nonn,easy

%O 0,9

%A _Clark Kimberling_, Apr 04 2014

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 8 11:24 EDT 2024. Contains 375753 sequences. (Running on oeis4.)