This site is supported by donations to The OEIS Foundation.

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A201090 Number of -n..n arrays of 5 elements with first and second differences also in -n..n 1
 47, 537, 2771, 9593, 25935, 59533, 121371, 226521, 394443, 649989, 1023515, 1552101, 2279419, 3257221, 4544919, 6211381, 8334179, 11001745, 14312231, 18376077, 23314439, 29262209, 36365967, 44787505, 54701247, 66298329, 79783443 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 5 of A201088 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +2*a(n-2) -5*a(n-3) -2*a(n-4) +4*a(n-5) +4*a(n-6) -2*a(n-7) -5*a(n-8) +2*a(n-9) +2*a(n-10) -a(n-11). Empirical: -x*(-47 -443*x -1603*x^2 -3212*x^3 -3986*x^4 -3218*x^5 -1606*x^6 -436*x^7 -47*x^8 -3*x^9 +x^10) / ( (1+x+x^2)*(1+x)^3*(x-1)^6 ). - R. J. Mathar, Nov 27 2011 EXAMPLE Some solutions for n=6 ..0....1....3....5....2...-1....6...-2...-1...-4....5....2....6....5....4....5 ..4....0....0....2....3...-2....3....0...-5...-4....0...-3....0....2....2....1 ..5...-1....0...-3...-1...-4....0...-1...-6...-6....0...-3...-2....1....1...-2 ..2....3...-3...-4....1...-2....2...-1...-3...-4....0....1...-3....4...-3...-1 .-4....4...-4...-1....6...-6....5....1....1....0....0....5...-1....5...-2....4 CROSSREFS Sequence in context: A106104 A009086 A034779 * A116146 A142253 A142577 Adjacent sequences:  A201087 A201088 A201089 * A201091 A201092 A201093 KEYWORD nonn AUTHOR R. H. Hardin Nov 26 2011 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.