

A143908


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


1



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
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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 nth 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 =
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;
...


CROSSREFS

A026150
Sequence in context: A243339 A244965 A049996 * A117572 A029153 A060241
Adjacent sequences: A143905 A143906 A143907 * A143909 A143910 A143911


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Sep 06 2008


STATUS

approved



