A131436 Triangle read by rows, (n-1) zeros followed by 2^n - 1.

1, 0, 3, 0, 0, 7, 0, 0, 0, 15, 0, 0, 0, 0, 31, 0, 0, 0, 0, 0, 63, 0, 0, 0, 0, 0, 0, 127, 0, 0, 0, 0, 0, 0, 0, 255, 0, 0, 0, 0, 0, 0, 0, 0, 511, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1023, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2047, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4095, 0, 0

Offset: 1

Author

Gary W. Adamson, Jul 11 2007

Keywords

• nonn
• tabl

Examples

			First few rows of the triangle are:
1;
0, 3;
0, 0, 7;
0, 0, 0, 15;
0, 0, 0, 0, 31;
...
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A131437, A131438, A131439.

Programs

Mathematica

Flatten[Table[{PadRight[{},n-1,0],2^n-1},{n,20}]] (* Harvey P. Dale, May 23 2012 *)

Formula

2*A059268(n)-A059268(n+1). - Paul Curtz, Jul 03 2008

Extensions

More terms from Harvey P. Dale, May 23 2012