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A171872 Triangle read by columns: Distinct classifications of N elements containing exactly R binary partitions. 6

%I

%S 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,

%T 2802,10087,26512,55088,91984,130267,157662,168890,158658,133576,

%U 98804,65664,38073,19963,9013,3779

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

%C 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.

%C See note on efficient computation in A171871.

%H R. Munafo, <a href="http://mrob.com/pub/math/seq-a005646.html">Classifications of N Elements</a>

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

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

%K nonn,tabf

%O 0,8

%A _Robert Munafo_, Jan 21 2010

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Last modified June 25 07:53 EDT 2019. Contains 324347 sequences. (Running on oeis4.)