Number of partitions of subsets of {1,...,n}, where consecutive integers and the elements in {1, n} are required to be in different parts.

A261489

Number of partitions of subsets of {1,...,n}, where consecutive integers and the elements in {1, n} are required to be in different parts.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =8a(4) =25a(5) =82a(6) =313a(7) =1318a(8) =6098a(9) =30603a(10) =165282a(11) =954065a(12) =5853242a(13) =37987146a(14) =259751877a(15) =1864926846a(16) =14016442573a(17) =109985575616a(18) =898948324164

External references