This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A244804 The 300º spoke (or ray) of a hexagonal spiral of Ulam. 7
 1, 14, 51, 112, 197, 306, 439, 596, 777, 982, 1211, 1464, 1741, 2042, 2367, 2716, 3089, 3486, 3907, 4352, 4821, 5314, 5831, 6372, 6937, 7526, 8139, 8776, 9437, 10122, 10831, 11564, 12321, 13102, 13907, 14736, 15589, 16466, 17367, 18292, 19241, 20214, 21211, 22232, 23277, 24346, 25439 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Colin Barker, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA see A056105 example section for its formula. From Colin Barker, Dec 12 2016: (Start) a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>3. G.f.: x*(1 + 11*x + 12*x^2) / (1 - x)^3. (End) EXAMPLE see A056105 example section for its diagram. MAPLE A244804:=n->12*n^2 - 23*n + 12: seq(A244804(n), n=1..50); # Wesley Ivan Hurt, Jul 06 2014 MATHEMATICA f[n_] := 12n^2 - 23n + 12; Array[f, 47] PROG (PARI) vector(50, n, 12*n^2 - 23*n + 12) \\ Michel Marcus, Jul 06 2014 (PARI) Vec(x*(1 + 11*x + 12*x^2) / (1 - x)^3 + O(x^50)) \\ Colin Barker, Dec 12 2016 (MAGMA) [ 12*n^2 - 23*n + 12 : n in [1..50] ]; // Wesley Ivan Hurt, Jul 06 2014 CROSSREFS Cf. A056105, A244802, A056106, A244803, A056107, A056108, A244805, A056109, A244806, A003215, A033577. Sequence in context: A043132 A039309 A043912 * A009961 A059997 A007588 Adjacent sequences:  A244801 A244802 A244803 * A244805 A244806 A244807 KEYWORD nonn,easy AUTHOR Robert G. Wilson v, Jul 06 2014 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 12 09:56 EST 2018. Contains 318056 sequences. (Running on oeis4.)