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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A100256 Squares of second pentagonal numbers: (1/4) n^2(3n+1)^2. 1
 0, 4, 49, 225, 676, 1600, 3249, 5929, 10000, 15876, 24025, 34969, 49284, 67600, 90601, 119025, 153664, 195364, 245025, 303601, 372100, 451584, 543169, 648025, 767376, 902500, 1054729, 1225449, 1416100, 1628176, 1863225, 2122849 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..31. L. Euler, De mirabilibus proprietatibus numerorum pentagonalium, par. 29 L. Euler, On the remarkable properties of the pentagonal numbers FORMULA G.f.: x*(4+29*x+20*x^2+x^3)/(1-x)^5. [Colin Barker, Feb 14 2012] CROSSREFS Equals A005449(n)^2. Cf. A100255. Sequence in context: A166826 A295535 A078187 * A163944 A000596 A113525 Adjacent sequences: A100253 A100254 A100255 * A100257 A100258 A100259 KEYWORD nonn AUTHOR Ralf Stephan, Nov 13 2004 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 June 20 01:56 EDT 2024. Contains 373510 sequences. (Running on oeis4.)