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A104571 Triangle T(n,k) = A042948(n-k+1) read by rows, 0<=k<=n. 0
1, 4, 1, 5, 4, 1, 8, 5, 4, 1, 9, 8, 5, 4, 1, 12, 9, 8, 5, 4, 1, 13, 12, 9, 8, 5, 4, 1, 16, 13, 12, 9, 8, 5, 4, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..35.

FORMULA

The triangle is extracted from the product of lower triangular matrices (with the rest of the terms all zeros): G * R (or R * G); G = [1; 3, 1; 1, 3, 1; 3, 1, 3, 1;...]; R = [1; 1, 1; 1, 1, 1;...].

EXAMPLE

The first few rows are:

1;

4, 1;

5, 4, 1;

8, 5, 4, 1;

9, 8, 5, 4, 1;

...

CROSSREFS

Cf. A042948, A035608 (row sums), A104570, A104569, A074377.

Sequence in context: A214892 A030352 A212643 * A249057 A105721 A099310

Adjacent sequences:  A104568 A104569 A104570 * A104572 A104573 A104574

KEYWORD

nonn,tabl,easy

AUTHOR

Gary W. Adamson, Mar 16 2005

STATUS

approved

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Last modified December 15 15:01 EST 2019. Contains 329999 sequences. (Running on oeis4.)