A274636 Square array read by antidiagonals: T(m,n) (m>=0, n>=0) = (2^floor(m/2)+1)*(2^ceiling(n/2)+1).

4, 4, 6, 6, 6, 6, 6, 9, 6, 10, 10, 9, 9, 10, 10, 10, 15, 9, 15, 10, 18, 18, 15, 15, 15, 15, 18, 18, 18, 27, 15, 25, 15, 27, 18, 34, 34, 27, 27, 25, 25, 27, 27, 34, 34, 34, 51, 27, 45, 25, 45, 27, 51, 34, 66, 66, 51, 51, 45, 45, 45, 45, 51, 51, 66, 66, 66, 99, 51, 85, 45, 81, 45, 85, 51, 99, 66, 130

Offset

0,1

Links

Table of n, a(n) for n=0..77.

Example

The array begins:
4, 6, 6, 10, 10, 18, 18, 34, 34, 66, 66, 130, 130, ...
4, 6, 6, 10, 10, 18, 18, 34, 34, 66, 66, 130, 130, ...
6, 9, 9, 15, 15, 27, 27, 51, 51, 99, 99, 195, 195, ...
6, 9, 9, 15, 15, 27, 27, 51, 51, 99, 99, 195, 195, ...
10, 15, 15, 25, 25, 45, 45, 85, 85, 165, 165, 325, 325, ...
10, 15, 15, 25, 25, 45, 45, 85, 85, 165, 165, 325, 325, ...
18, 27, 27, 45, 45, 81, 81, 153, 153, 297, 297, 585, 585, ...
...

Crossrefs

The main diagonal is conjectured to be A183978. Cf. A274635, A274637.

Sequence in context: A213342 A019559 A365198 * A198697 A111657 A049751

Adjacent sequences: A274633 A274634 A274635 * A274637 A274638 A274639

Keyword

nonn,tabl

Author

N. J. A. Sloane, Jul 08 2016

Status

approved