A139754 a(n) = floor(n*2*(3^n-2^n)/2^n).

1, 5, 14, 32, 65, 124, 225, 394, 673, 1133, 1880, 3089, 5034, 8146, 13106, 20986, 33464, 53168, 84201, 132970, 209449, 329156, 516200, 807989, 1262508, 1969539, 3067962, 4772414, 7414316, 11505003

Offset

1,2

Links

Table of n, a(n) for n=1..30.

Mathematica

Table[Floor[2n((3^n-2^n)/2^n)], {n, 30}] (* Harvey P. Dale, Feb 09 2018 *)

Crossrefs

Sequence in context: A211803 A299275 A266759 * A036595 A180668 A053209

Adjacent sequences: A139751 A139752 A139753 * A139755 A139756 A139757

Keyword

easy,nonn

Author

Ctibor O. Zizka, May 19 2008

Status

approved