This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A144560 Ten times hexagonal numbers: 10*n*(2*n-1). 1
 0, 10, 60, 150, 280, 450, 660, 910, 1200, 1530, 1900, 2310, 2760, 3250, 3780, 4350, 4960, 5610, 6300, 7030, 7800, 8610, 9460, 10350, 11280, 12250, 13260, 14310, 15400, 16530, 17700, 18910, 20160, 21450, 22780, 24150, 25560, 27010 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Sequence found by reading the line from 0, in the direction 0, 10,..., in the square spiral whose vertices are the generalized dodecagonal numbers A195162. - Omar E. Pol, Sep 18 2011 LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 20n^2 - 10n = A000384(n)*10 = A002939(n)*5 = A152745(n)*2. a(n) = a(n-1)+40*n-30  (with a(0)=0). - Vincenzo Librandi, Dec 14 2010 PROG (PARI) a(n)=10*n*(2*n-1) \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A000384, A002939, A152745, A152994. Sequence in context: A066290 A065641 A121874 * A076160 A266732 A283727 Adjacent sequences:  A144557 A144558 A144559 * A144561 A144562 A144563 KEYWORD easy,nonn AUTHOR Omar E. Pol, Jan 01 2009 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 December 8 09:53 EST 2019. Contains 329862 sequences. (Running on oeis4.)