A013901 a(n) = 21^(5*n + 4).

194481, 794280046581, 3243919932521508681, 13248496640331026125580781, 54108198377272584130510593262881, 220983347100817338120002444455525554981, 902518308877795191433240103403256374623457081, 3685975927806112219127687339549342762856035687969181

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..50
• Tanya Khovanova, Recursive Sequences
• Index entries for linear recurrences with constant coefficients, signature (4084101).

Crossrefs

Cf. A009965.

Programs

Magma

[21^(5*n+4): n in [0..10]]; // Vincenzo Librandi, May 27 2011

Mathematica

NestList[4084101#&,194481,10] (* Harvey P. Dale, Dec 03 2014 *)

Formula

a(n) = 4084101*a(n-1), a(0)=194481. - Vincenzo Librandi, May 27 2011