The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A121811 This sequence needs a meaningful name. 0
 0, 3, 8, 19, 46, 111, 263, 622, 1473, 3485, 8246, 19512, 46166, 109230, 258441, 611480, 1446777, 3423112, 8099170, 19162842, 45339771, 107275050, 253815495, 600533909, 1420878484, 3361834590, 7954186044, 18819806248, 44528139677 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..29. MATHEMATICA M = N[Abs[MatrixPower[{{0, 1, 1, 1}, {1, 0, 1, 1}, {1, 1, 0, 1}, {1, 1, 1, 0}}, 1/2]]] v[1] = {0, 1, 2, 3} v[n_] := v[n] = M.v[n - 1] Table[Floor[v[n][[1]]], {n, 1, 50}] CROSSREFS Cf. A120471. Sequence in context: A309537 A126874 A284942 * A244208 A296329 A339525 Adjacent sequences: A121808 A121809 A121810 * A121812 A121813 A121814 KEYWORD nonn,uned,easy,less AUTHOR Roger L. Bagula, Aug 30 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 29 17:03 EST 2023. Contains 367445 sequences. (Running on oeis4.)