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!)
A158145 Number of nondecreasing integer sequences of length 11 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 120, 217, 446, 773, 1408, 2279, 3955, 6073, 9760, 14692, 22467, 32445, 48073, 67444, 96568, 132921, 184487, 248245, 338391, 446533, 594557, 774198, 1012918, 1297749, 1674816, 2117060, 2691887, 3368516, 4226714, 5231183, 6500798 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000041(n)^2 for n<=5

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

LINKS

R. H. Hardin, Table of n, a(n) for n=1..495

CROSSREFS

Sequence in context: A182988 A158144 A247136 * A082180 A246131 A068999

Adjacent sequences:  A158142 A158143 A158144 * A158146 A158147 A158148

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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 27 04:33 EDT 2022. Contains 357052 sequences. (Running on oeis4.)