A173398 (A007318 + A112468)/2.

1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 4, 2, 1, 1, 1, 7, 4, 3, 1, 1, 1, 11, 7, 9, 3, 1, 1, 1, 16, 11, 22, 9, 4, 1, 1, 1, 22, 16, 46, 22, 16, 4, 1, 1, 1, 29, 22, 86, 46, 50, 16, 5, 1, 1, 1, 37, 29, 148, 86, 130, 50, 25, 5, 1

Offset: 1

Author

Mark Dols, Feb 17 2010, Feb 21 2010

Keywords

• nonn
• tabl

Comments

If first row is omitted,same as A131054.

Examples

			Array starts:
1,1,1,1
1,1,2,2
1,1,4,4
1,1,7,7
		

Crossrefs

Cf. A007318, A112468, A131054