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!)
A158146 Number of nondecreasing integer sequences of length 12 with sum zero and sum of absolute values 2n. 1

%I

%S 1,4,9,25,49,121,222,466,828,1537,2546,4506,7097,11656,17964,28080,

%T 41533,62829,90245,131868,185633,262931,361620,502438,677292,919091,

%U 1221175,1627409,2126641,2793158,3599216,4655834,5933603,7571871,9539554

%N Number of nondecreasing integer sequences of length 12 with sum zero and sum of absolute values 2n.

%C a(n) = A000041(n)^2 for n<=6

%C a(n) = A000041(n)^2 - cumulative A000712(2*n-1-length), 0 <= 2*n-1-length <= floor(n/2) [empirical].

%H R. H. Hardin, <a href="/A158146/b158146.txt">Table of n, a(n) for n=1..474</a>

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 13 2009

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 25 12:12 EDT 2022. Contains 356984 sequences. (Running on oeis4.)