login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A171966 Number of partitions of n having no more odd than even parts. 14
1, 0, 1, 1, 2, 3, 4, 6, 8, 12, 15, 21, 28, 37, 49, 63, 83, 105, 138, 171, 223, 275, 353, 433, 551, 673, 846, 1031, 1282, 1558, 1922, 2327, 2848, 3440, 4179, 5032, 6078, 7293, 8763, 10482, 12534, 14943, 17797, 21146, 25090, 29719, 35138, 41493, 48908, 57578 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

a(n) = A108949(n) + A045931(n) = A000041(n) - A108950(n).

a(n) = Sum_{k=-floor(n/2)+(n mod 2)..0} A240009(n,k). - Alois P. Heinz, Mar 30 2014

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..500

MAPLE

b:= proc(n, i, t) option remember; `if`(n=0,

      `if`(t<=0, 1, 0), `if`(i<1, 0, b(n, i-1, t)+

      `if`(i>n, 0, b(n-i, i, t+(2*irem(i, 2)-1)))))

    end:

a:= n-> b(n$2, 0):

seq(a(n), n=0..80);  # Alois P. Heinz, Mar 30 2014

MATHEMATICA

$RecursionLimit = 1000; b[n_, i_, t_] := b[n, i, t] = If[n == 0, If[t <= 0, 1, 0], If[i<1, 0, b[n, i-1, t] + If[i>n, 0, b[n-i, i, t+(2*Mod[i, 2]-1)]]]]; a[n_] := b[n, n, 0]; Table[a[n], {n, 0, 80}] (* Jean-Fran├žois Alcover, Jun 30 2015, after Alois P. Heinz *)

CROSSREFS

Cf. A130780, A171967.

Sequence in context: A309353 A081029 A300787 * A034893 A187448 A321266

Adjacent sequences:  A171963 A171964 A171965 * A171967 A171968 A171969

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jan 21 2010

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 19 11:26 EDT 2019. Contains 328216 sequences. (Running on oeis4.)