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A033584 11n^2. 7
0, 11, 44, 99, 176, 275, 396, 539, 704, 891, 1100, 1331, 1584, 1859, 2156, 2475, 2816, 3179, 3564, 3971, 4400, 4851, 5324, 5819, 6336, 6875, 7436, 8019, 8624, 9251, 9900, 10571, 11264, 11979, 12716 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Number of edges of the complete tripartite graph of order 7n, K_n,n,5n - Roberto E. Martinez II, Jan 07 2002

Number of edges of the complete tripartite graph of order 6n, K_n,2n,3n - Roberto E. Martinez II, Jan 07 2002

11 times the squares. - Omar E. Pol, Dec 13 2008

LINKS

Table of n, a(n) for n=0..34.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

a(n) = A000290(n)*11. - Omar E. Pol, Dec 13 2008

a(n)=22*n+a(n-1)-11 (with a(0)=0) - Vincenzo Librandi, Aug 05 2010

EXAMPLE

a(1)=22*1+0-11=11; a(2)=22*2+11-11=44; a(3)=22*3+44-11=99 - Vincenzo Librandi, Aug 05 2010

PROG

(PARI) a(n)=11*n^2 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Cf. A000290.

Sequence in context: A022703 A061976 A070930 * A248126 A253445 A172526

Adjacent sequences:  A033581 A033582 A033583 * A033585 A033586 A033587

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 19 16:10 EST 2017. Contains 294936 sequences.