A143316 Triangle read by rows, A054525 * A143315, 1<=k<=n.

1, 2, 1, 4, 0, 1, 4, 2, 0, 1, 8, 0, 0, 0, 1, 4, 4, 2, 0, 0, 1, 12, 0, 0, 0, 0, 0, 1, 8, 4, 0, 2, 0, 0, 0, 1, 12, 0, 4, 0, 0, 0, 0, 0, 1, 8, 8, 0, 0, 2, 0, 0, 0, 0, 1, 20, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 8, 4, 4, 4, 0, 2, 0, 0, 0, 0, 0, 1, 24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 12, 12, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 1

Offset

1,2

Comments

Row sums = 2*n-1.

Left border = A140434: (1, 2, 4, 4, 8, 4, 12, 8,...).

Links

Table of n, a(n) for n=1..105.

Example

First few rows of the triangle =
1;
2, 1;
4, 0, 1;
4, 2, 0, 1;
8, 0, 0, 0, 1;
4, 4, 2, 0, 0, 1;
12, 0, 0, 0, 0, 0, 1;
8, 4, 0, 2, 0, 0, 0, 1;
...

Crossrefs

Cf. A054525, A140434, A143315.

Sequence in context: A225777 A016585 A309054 * A127192 A122141 A091604

Adjacent sequences: A143313 A143314 A143315 * A143317 A143318 A143319

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 06 2008

Extensions

a(19) corrected and more terms from Georg Fischer, Aug 14 2023

Status

approved