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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A024391 2nd elementary symmetric function of the first n+1 positive integers congruent to 2 mod 3. 5
 10, 66, 231, 595, 1275, 2415, 4186, 6786, 10440, 15400, 21945, 30381, 41041, 54285, 70500, 90100, 113526, 141246, 173755, 211575, 255255, 305371, 362526, 427350, 500500, 582660, 674541, 776881, 890445, 1016025, 1154440, 1306536, 1473186, 1655290 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1). FORMULA a(n) = n*(n+1)*(3*n+2)*(3*n+5)/8. O.g.f.: -x*(10+16*x+x^2)/(-1+x)^5 . - R. J. Mathar, Feb 14 2008 MATHEMATICA LinearRecurrence[{5, -10, 10, -5, 1}, {10, 66, 231, 595, 1275}, 50] (* Harvey P. Dale, Aug 19 2019 *) CROSSREFS Sequence in context: A269679 A211056 A269468 * A074362 A080421 A320817 Adjacent sequences:  A024388 A024389 A024390 * A024392 A024393 A024394 KEYWORD nonn,easy AUTHOR 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 August 11 22:58 EDT 2022. Contains 356067 sequences. (Running on oeis4.)