A171872 Triangle read by columns: Distinct classifications of N elements containing exactly R binary partitions.

1, 0, 1, 0, 1, 1, 0, 2, 3, 3, 1, 1, 0, 3, 17, 36, 60, 56, 50, 27, 19, 6, 4, 1, 1, 0, 6, 74, 573, 2802, 10087, 26512, 55088, 91984, 130267, 157662, 168890, 158658, 133576, 98804, 65664, 38073, 19963, 9013, 3779

Offset: 0

Author

Robert Munafo, Jan 21 2010

Keywords

• nonn
• tabf

Comments

The bottom of each column is marked by a single 0 in this sequence. Value is 0 for all (N,R) for which N is greater than 2^R.

See note on efficient computation in A171871.

Links

• R. Munafo, Classifications of N Elements

Crossrefs

First term in each column is A000055(R+1).

Column 4 shares terms with A034189, column 5 with A034190.