A164561 Triangle with elements A120070(m,n)/A120072(m,n) read by rows, m>=2, 1<=n

1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 16, 27, 4, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 16, 1, 4, 1, 1, 1, 9, 1, 1, 9, 1, 1, 1, 16, 1, 4, 25, 16, 1, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 27, 128, 1, 108, 1, 16, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 16, 1, 4, 1, 16, 49, 4, 1, 16, 1, 4, 1, 1, 1, 27, 1

Offset: 2

Author

Paul Curtz, Aug 16 2009

Keywords

• nonn
• tabl
• easy

Examples

			The triangle starts in row m=2 as
1;
1, 1;
1, 4, 1;
1, 1, 1, 1;
1, 16, 27, 4, 1;
1, 1, 1, 1, 1, 1;
1, 4, 1, 16, 1, 4, 1;
		

Programs

Maple

A120070 := proc(m,n) m^2-n^2 ; end: A120072 := proc(m,n) numer(1/n^2-1/m^2) ; end:
A164561 := proc(m,n) A120070(m,n)/A120072(m,n) ; end: seq( seq(A164561(m,n),n=1..m-1), m=2..30) ; # R. J. Mathar, Aug 19 2009

Extensions

Edited and extended by R. J. Mathar, Aug 19 2009