A117137 Same as triangle in A117136, but omit final 1 from each row.

1, 1, 2, 4, 1, 3, 6, 2, 7, 1, 4, 8, 3, 9, 2, 10, 1, 5, 10, 4, 11, 3, 12, 2, 13, 1, 6, 12, 5, 13, 4, 14, 3, 15, 2, 16, 1, 7, 14, 6, 15, 5, 16, 4, 17, 3, 18, 2, 19, 1

Offset: 0

Author

N. J. A. Sloane, Apr 21 2006

Keywords

• nonn
• tabf

Comments

Row n has length 2n+1.

Examples

			Triangle begins:
Row 0: 1
Row 1: 1 2 4
Row 2: 1 3 6 2 7
Row 3: 1 4 8 3 9 2 10
Row 4: 1 5 10 4 11 3 12 2 13
...
		

Crossrefs

Cf. A117136, A046901, A008344.

The segments of A046901 appear as rows 2, 7, 22, 67, ... (A060816) of this array.