Number of partitions of subsets of {1,...,n}, where consecutive integers are required to be in the same part and the elements of {1, n} are required to be in the same part if they are both members of a subset.

A261492

Number of partitions of subsets of {1,...,n}, where consecutive integers are required to be in the same part and the elements of {1, n} are required to be in the same part if they are both members of a subset.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =8a(4) =18a(5) =42a(6) =102a(7) =254a(8) =648a(9) =1688a(10) =4486a(11) =12146a(12) =33474a(13) =93810a(14) =267112a(15) =772124a(16) =2264214a(17) =6731254a(18) =20275118a(19) =61841886a(20) =190914356a(21) =596256556a(22) =1883148834a(23) =6012081046a(24) =19395355770a(25) =63205986042a(26) =208003526516a(27) =691048272152

External references