A143908 - OEIS

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A143908

Eigentriangle by rows, n terms of (3 * A026150) followed by A026150(n).

1, 3, 1, 3, 3, 4, 3, 3, 12, 10, 3, 3, 12, 30, 28, 3, 3, 12, 30, 84, 76, 3, 3, 12, 30, 84, 228, 208, 3, 3, 12, 30, 84, 228, 624, 568, 3, 3, 12, 30, 84, 228, 624, 1704, 1552

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

Right border = A026150: (1, 1, 4, 10, 28, 76, 208, 568,...).

Row sums = (1, 4, 10, 28, 76,...) = INVERT transform of (1, 3, 3, 3,...).

Sum of n-th row terms = rightmost term of next row.

LINKS

Table of n, a(n) for n=0..44.

FORMULA

Eigentriangle by rows, n terms of (3 * A026150) followed by A026150(n).

EXAMPLE

First few rows of the triangle =

3, 1;

3, 3, 4;

3, 3, 12, 10;

3, 3, 12, 30, 28;

3, 3, 12, 30, 84, 76;

3, 3, 12, 30, 84, 228, 208;

...

CROSSREFS

A026150

Sequence in context: A244965 A049996 A344793 * A349814 A117572 A029153

Adjacent sequences: A143905 A143906 A143907 * A143909 A143910 A143911

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Sep 06 2008

STATUS

approved