1,3

a(n+1) gives row sum of row n of this triangle.

Conjecture: a(n) for n>1 gives first differences of Lionel Levile's sequence A014644(n) for n>=3.

Conjecture: Final elements of the rows form A014644 except for duplicate 2.

The triangle begins 1; 2; 3,3; 4,4,4,5,5,5; ...

Row 4: [4,4,4,5,5,5] is generated from row 3: [3,3] because there are (3) 4's and (3) 5's in row 4.

Sequence in context: A011834 A003513 A113731 this_sequence A153253 A074925 A141136

Adjacent sequences: A113673 A113674 A113675 this_sequence A113677 A113678 A113679

nonn

Floor van Lamoen (fvlamoen(AT)hotmail.com) and Paul D. Hanna (pauldhanna(AT)juno.com), Nov 06 2005