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!)
 A181892 (n!/4-1)^2. 4
 25, 841, 32041, 1585081, 101586241, 8229936961, 823010025601, 99584412681601, 14340158060659201, 2423486749613529601, 475003403490910694401, 106875765794608626816001, 27360196043576729389056001, 7907096656596520292861952001, 2561899316737326995063771136001 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS These are maximal values y^2 in solutions to x^2-y^2=n! which are ((n! + 4)/4)^2 - ((n! - 4)/4)^2 = n!. LINKS FORMULA a(n) = (A139174(n))^2. MATHEMATICA Table[((n! - 4)/4)^2, {n, 4, 20}] CROSSREFS Cf. A139151 (associated x). Sequence in context: A151557 A008844 A251925 * A274469 A223258 A209119 Adjacent sequences:  A181889 A181890 A181891 * A181893 A181894 A181895 KEYWORD nonn,easy AUTHOR Artur Jasinski, Mar 31 2012 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 April 17 22:19 EDT 2021. Contains 343071 sequences. (Running on oeis4.)