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A135387 Triangle read by rows, with (2, 1, 0, 0, 0,...) in every column. 3
2, 1, 2, 0, 1, 2, 0, 0, 1, 2, 0, 0, 0, 1, 2, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0, 0, 0, 1, 2 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Let the triangle = M, then M^n * [1, 1, 0, 0, 0,...] generates rows of triangle A118800. M^n * [1, 0, 0, 0,...] generates rows of triangle A038207.

Eigensequence of the triangle = the Pell numbers, A000129: (1, 2, 5, 12, 29,...). [From Gary W. Adamson, Dec 29 2008]

LINKS

Table of n, a(n) for n=1..45.

FORMULA

Triangle by columns (2, 1, 0, 0, 0, 0, 0,...) in every column. By rows, (n-2) zeros followed by 1, 2.

EXAMPLE

First few rows of the triangle are:

2;

1, 2

0, 1, 2;

0, 0, 1, 2;

0, 0, 0, 1, 2;

0, 0, 0, 0, 1, 2;

...

CROSSREFS

Cf. A118800, A038207.

A000129 [From Gary W. Adamson, Dec 29 2008]

Sequence in context: A140083 A277729 A057985 * A321104 A127442 A115628

Adjacent sequences:  A135384 A135385 A135386 * A135388 A135389 A135390

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Dec 09 2007

STATUS

approved

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Last modified February 26 12:43 EST 2020. Contains 332280 sequences. (Running on oeis4.)