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!)
 A124846 Triangle read by rows: T(n,k) = (2 - (-1)^k)*binomial(n,k) (0 <= k <= n). 1
 1, 1, 3, 1, 6, 1, 1, 9, 3, 3, 1, 12, 6, 12, 1, 1, 15, 10, 30, 5, 3, 1, 18, 15, 60, 15, 18, 1, 1, 21, 21, 105, 35, 63, 7, 3, 1, 24, 28, 168, 70, 168, 28, 24, 1, 1, 27, 36, 252, 126, 378, 84, 108, 9, 3, 1, 30, 45, 360, 210, 756, 210, 360, 45, 30, 1, 1, 33, 55, 495, 330, 1386, 462, 990 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE First few rows of the triangle:   1;   1,  3;   1,  6,  1;   1,  9,  3,  3;   1, 12,  6, 12,  1;   1, 15, 10, 30,  5,  3;   ... A046055(4) = 16 = sum of row 4 terms (1 + 9 + 3 + 3). MAPLE T:=(n, k)->(2-(-1)^k)*binomial(n, k): for n from 0 to 12 do seq(T(n, k), k=0..n) od; # yields sequence in triangular form CROSSREFS Cf. A010684, A046055, A124845. Sequence in context: A301333 A213670 A116609 * A177375 A099512 A127096 Adjacent sequences:  A124843 A124844 A124845 * A124847 A124848 A124849 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Nov 10 2006 EXTENSIONS Edited by N. J. A. Sloane, Nov 24 2006 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 5 15:11 EST 2019. Contains 329753 sequences. (Running on oeis4.)