A274637 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, 2, 0, 0, 2, 3, 0, 0, 6, 3, 3, 0, 0, 6, 9, 3, 5, 0, 0, 14, 9, 9, 5, 5, 0, 0, 14, 21, 9, 15, 5, 9, 0, 0, 30, 21, 21, 15, 15, 9, 9, 0, 0, 30, 45, 21, 35, 15, 27, 9, 17, 0, 0, 62, 45, 45, 35, 35, 27, 27, 17, 17, 0, 0, 62, 93, 45, 75, 35, 63, 27, 51, 17, 33, 0, 0, 126, 93, 93, 75, 75, 63, 63, 51

Offset

0,4

Links

Table of n, a(n) for n=0..85.

Example

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, ...
2, 3, 3, 5, 5, 9, 9, 17, 17, 33, 33, 65, 65, ...
2, 3, 3, 5, 5, 9, 9, 17, 17, 33, 33, 65, 65, ...
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, ...
14, 21, 21, 35, 35, 63, 63, 119, 119, 231, 231, 455, 455, ...
...

Crossrefs

The main diagonal is A274638. Cf. A274635, A274636.

Sequence in context: A111006 A046742 A263138 * A178516 A306418 A323886

Adjacent sequences: A274634 A274635 A274636 * A274638 A274639 A274640

Keyword

nonn,tabl

Author

N. J. A. Sloane, Jul 08 2016

Status

approved