The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A056237 a(n) = 2*n^2 + 9*n - 5. 0
 6, 21, 40, 63, 90, 121, 156, 195, 238, 285, 336, 391, 450, 513, 580, 651, 726, 805, 888, 975, 1066, 1161, 1260, 1363, 1470, 1581, 1696, 1815, 1938, 2065, 2196, 2331, 2470, 2613, 2760, 2911, 3066, 3225, 3388, 3555, 3726, 3901, 4080, 4263, 4450, 4641, 4836, 5035 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES Michael Serra, Discovering geometry: an inductive approach, 2nd ed., Berkeley, Calif.: Key Curriculum Press, 1997, p. 61, Problem 8. LINKS Table of n, a(n) for n=1..48. Index entries for linear recurrences with constant coefficients, signature (3,-3,1). MATHEMATICA Table[2n^2+9n-5, {n, 50}] (* Harvey P. Dale, May 30 2021 *) CROSSREFS Sequence in context: A007339 A363621 A225150 * A364169 A364171 A199194 Adjacent sequences: A056234 A056235 A056236 * A056238 A056239 A056240 KEYWORD nonn,easy,less AUTHOR Pam Smith (homelizard(AT)aol.com), Aug 20 2000 EXTENSIONS Name clarified by Editors of OEIS, May 24 2021 More terms from Harvey P. Dale, May 30 2021 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.

Last modified September 22 10:00 EDT 2023. Contains 365520 sequences. (Running on oeis4.)