A153283 A triangular sequence designed with row sums 2*3^n.

2, 3, 3, 2, 14, 2, 2, 25, 25, 2, 2, 36, 86, 36, 2, 2, 47, 194, 194, 47, 2, 2, 56, 304, 734, 304, 56, 2, 2, 69, 410, 3412, 410, 69, 2, 2, 80, 518, 5961, 5961, 518, 80, 2

Offset

0,1

Comments

Row sums are:

{2, 6, 18, 54, 162, 486., 1458, 4374., 13122,...}.

Sequence was calculated to the 3^n level by hand.

Links

Table of n, a(n) for n=0..42.

Example

{2},
{3, 3},
{2, 14, 2},
{2, 25, 25, 2},
{2, 36, 86, 36, 2},
{2, 47, 194, 194, 47, 2},
{2, 56, 304, 734, 304, 56, 2},
{2, 69, 410, 3412, 410, 69, 2},
{2, 80, 518, 5961, 5961, 518, 80, 2}

Mathematica

a = {{1},
{3/2, 3/2},
{1, 7, 1},
{1, 25/2, 25/2, 1},
{1, 18, 43, 18, 1},
{1, 23.5, 97, 97, 23.5, 1},
{1, 28, 152, 367, 152, 28, 1},
{1, 34.5, 205, 1706, 205, 34.5, 1},
{1, 40, 259, 2980.5, 2980.5, 259, 40, 1}}
b = Rationalize[2*a];
Flatten[b]

Crossrefs

Sequence in context: A153516 A153311 A153312 * A153288 A153479 A153489

Adjacent sequences: A153280 A153281 A153282 * A153284 A153285 A153286

Keyword

nonn,tabl

Author

Roger L. Bagula, Dec 23 2008

Status

approved