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A001545 (5n+1)(5n+4). 1
4, 54, 154, 304, 504, 754, 1054, 1404, 1804, 2254, 2754, 3304, 3904, 4554, 5254, 6004, 6804, 7654, 8554, 9504, 10504, 11554, 12654, 13804, 15004, 16254, 17554, 18904, 20304, 21754, 23254, 24804, 26404, 28054, 29754, 31504, 33304, 35154, 37054, 39004, 41004 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

T. D. Noe, Table of n, a(n) for n = 0..1000

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

FORMULA

a(n) = 50*n + a(n-1) with a(0)=4. - Vincenzo Librandi, Jan 20 2011

MATHEMATICA

Table[(5n+1)(5n+4), {n, 0, 60}] (* or *) LinearRecurrence[{3, -3, 1}, {4, 54, 154}, 60] (* Harvey P. Dale, Mar 17 2019 *)

PROG

(PARI) a(n)=(5*n+1)*(5*n+4) \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Equals 50 * A000217(n) + 4.

Sequence in context: A158259 A095210 A156469 * A208954 A269507 A302942

Adjacent sequences:  A001542 A001543 A001544 * A001546 A001547 A001548

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 21 22:47 EDT 2019. Contains 328315 sequences. (Running on oeis4.)