The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A158142 Number of nondecreasing integer sequences of length 8 with sum zero and sum of absolute values 2n. 1
 1, 4, 9, 25, 46, 103, 163, 307, 478, 791, 1143, 1818, 2495, 3663, 4994, 7002, 9154, 12532, 15986, 21200, 26726, 34398, 42532, 54145, 65791, 81872, 98871, 121163, 144174, 175083, 206075, 246947, 289116, 342271, 397027, 467462, 537495, 626427 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) = A000041(n)^2 for n<=4 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..689 CROSSREFS Sequence in context: A238334 A130448 A046451 * A158143 A082200 A244557 Adjacent sequences:  A158139 A158140 A158141 * A158143 A158144 A158145 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 12 17:17 EDT 2020. Contains 336439 sequences. (Running on oeis4.)