A137853 Triangle read by rows: row sums give natural numbers A000027.

1, 0, 2, 1, 2, 0, 1, 0, 3, 0, 0, 2, 3, 0, 0, 1, 2, 3, 0, 0, 0, 1, 2, 0, 4, 0, 0, 0, 1, 0, 3, 4, 0, 0, 0, 0, 0, 2, 3, 4, 0, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 5, 0, 0, 0, 0, 0, 0, 1, 2, 0, 4, 5, 0, 0, 0, 0, 0, 0, 0, 1, 0, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset: 1

Author

Mats Granvik, Feb 14 2008

Keywords

• nonn
• tabl

Comments

Each row contains a series of consecutive numbers. There is a diagonal pattern of zeros in the left part of the table.

Examples

			1 = 1
0+2 = 2
1+2+0 = 3
1+0+3+0 = 4
0+2+3+0+0 = 5
1+2+3+0+0+0 = 6
1+2+0+4+0+0+0 = 7
1+0+3+4+0+0+0+0 = 8
0+2+3+4+0+0+0+0+0 = 9
		

Crossrefs

Cf. A000027.