A274635 Square array read by antidiagonals: T(m,n) (m>=0, n>=0) = (2^floor(m/2)-1)*(2^ceiling(n/2)-1).

0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 3, 1, 3, 0, 0, 0, 3, 3, 3, 3, 0, 0, 0, 7, 3, 9, 3, 7, 0, 0, 0, 7, 7, 9, 9, 7, 7, 0, 0, 0, 15, 7, 21, 9, 21, 7, 15, 0, 0, 0, 15, 15, 21, 21, 21, 21, 15, 15, 0, 0, 0, 31, 15, 45, 21, 49, 21, 45, 15, 31, 0, 0, 0, 31, 31, 45, 45, 49, 49, 45, 45, 31, 31, 0

Offset: 0

Author

N. J. A. Sloane, Jul 08 2016

Keywords

• nonn
• tabl

Examples

			The array begins:
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
0, 1, 1, 3, 3, 7, 7, 15, 15, 31, 31, 63, 63, ...
0, 1, 1, 3, 3, 7, 7, 15, 15, 31, 31, 63, 63, ...
0, 3, 3, 9, 9, 21, 21, 45, 45, 93, 93, 189, 189, ...
0, 3, 3, 9, 9, 21, 21, 45, 45, 93, 93, 189, 189, ...
0, 7, 7, 21, 21, 49, 49, 105, 105, 217, 217, 441, 441, ...
...
		

Crossrefs

The main diagonal is A274230. Cf. A274636.