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

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Last modified October 18 07:00 EDT 2018. Contains 316307 sequences. (Running on oeis4.)