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!)
 A204327 a(n) = Pell(n^2). 2
 1, 12, 985, 470832, 1311738121, 21300003689580, 2015874949414289041, 1111984844349868137938112, 3575077977948634627394046618865, 66992092050551637663438906713182313772, 7316660981177400006023755031791634132229378601 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Here Pell(n) = A000129(n). LINKS FORMULA a(n) = ( (1+sqrt(2))^(n^2) - (1-sqrt(2))^(n^2) ) / (2*sqrt(2)). EXAMPLE G.f.: A(x) = x + 12*x^2 + 985*x^3 + 470832*x^4 + 1311738121*x^5 +... PROG (PARI) {Pell(n)=polcoeff(x/(1-2*x-x^2+x*O(x^n)), n)} {a(n)=Pell(n^2)} CROSSREFS Cf. A204274, A165938, A165937, A166879, A054783. Sequence in context: A278705 A180237 A079916 * A123283 A272855 A265488 Adjacent sequences:  A204324 A204325 A204326 * A204328 A204329 A204330 KEYWORD nonn AUTHOR Paul D. Hanna, Jan 14 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 September 18 03:36 EDT 2021. Contains 347504 sequences. (Running on oeis4.)