A113676 Number of elements of rows of Golomb's sequence A001462, with one less 2, interpreted as triangle: Start with first row 1. The row sum of row n-1 gives the number of elements taken from A001642 (one less 2) of row n.

1, 1, 2, 6, 27, 234, 6202, 1084009, 4362192095

Offset

1,3

Comments

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.

Links

Table of n, a(n) for n=1..9.

Example

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.

Crossrefs

Sequence in context: A011834 A003513 A113731 * A183323 A153253 A174880

Adjacent sequences: A113673 A113674 A113675 * A113677 A113678 A113679

Keyword

nonn

Author

Floor van Lamoen and Paul D. Hanna, Nov 06 2005

Status

approved