Number of partitional matroids on n elements.

Terms

a(0) =1a(1) =2a(2) =5a(3) =16a(4) =62a(5) =276a(6) =1377a(7) =7596a(8) =45789a(9) =298626a(10) =2090910a(11) =15621640a(12) =123897413a(13) =1038535174a(14) =9165475893a(15) =84886111212a(16) =822648571314