login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A129205 From Wendt's determinant compute (A048954(2*n)/(1-4^n))^(1/2). 2
1, 5, 0, 2295, 453871, 0, 545539395584, 4883188189089105, 0, 14214363393075742724609375, 5968603205606800870499639536231, 0, 41302584753289717847206700750464023881130441 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

P. Ribenboim, 13 Lectures on Fermat's last theorem, Springer-Verlag, NY, 1979, page 62. MR0551363 (81f:10023)

LINKS

Table of n, a(n) for n=1..13.

FORMULA

a(n)=0 if and only if n is divisible by 3.

a(n) = A215615(2*n). - Jonathan Sondow, Aug 17 2012

PROG

(PARI) {a(n)= if(n<1, 0, n*=2; sqrtint( matdet( matrix( n, n, i, j, binomial( n, (j-i)%n )))/ (1-2^n)))}

CROSSREFS

Cf. A048954, A215615, A215616.

Sequence in context: A226156 A215616 A249737 * A098173 A180977 A269129

Adjacent sequences:  A129202 A129203 A129204 * A129206 A129207 A129208

KEYWORD

nonn

AUTHOR

Michael Somos, Apr 03 2007

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 23 07:20 EDT 2018. Contains 316520 sequences. (Running on oeis4.)