

A143595


Triangle read by rows, A000012 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's); 1<=k<=n.


3



1, 2, 2, 3, 4, 2, 4, 6, 4, 2, 5, 8, 6, 4, 2, 6, 10, 8, 6, 4, 2, 7, 12, 10, 8, 6, 4, 2, 8, 14, 12, 10, 8, 6, 4, 2, 9, 16, 14, 12, 10, 8, 6, 4, 2, 10, 18, 16, 14, 12, 10, 8, 6, 4, 2, 11, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2
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OFFSET

1,2


COMMENTS

Row sums = n^2.
The linear sequence A056944 is more appropriately a triangle, (reversal of A143595).


LINKS

Table of n, a(n) for n=1..66.


FORMULA

Triangle read by rows, A000012 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's); i.e. (1; 1,2; 1,2,2;...). A000012 = an infinite lower triangular matrix with all 1's. 1<=k<=n


EXAMPLE

First few rows of the triangle =
1;
2, 2;
3, 4, 2;
4, 6, 4, 2;
5, 8, 6, 4, 2;
6, 10, 8, 6, 4, 2;
7, 12, 10, 8, 6, 4, 2;
...


CROSSREFS

Cf. A056944.
Sequence in context: A238971 A194331 A290600 * A211702 A208521 A209570
Adjacent sequences: A143592 A143593 A143594 * A143596 A143597 A143598


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Aug 26 2008


STATUS

approved



