A013899 a(n) = 21^(5*n + 2).

441, 1801088541, 7355827511386641, 30041942495081691894741, 122694327386105632949003612841, 501096025171921401632658604207540941, 2046526777500669368329342638102622164679041, 8358222058517261267863236597617557285387836027141

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+2): n in [0..10]]; // Vincenzo Librandi, May 27 2011

Mathematica

NestList[4084101#&,441,10] (* Harvey P. Dale, Sep 26 2023 *)

Formula

a(n) = 4084101*a(n-1), a(0)=441. - Vincenzo Librandi, May 27 2011