Number of set partitions of [n] having no pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
A270954
Number of set partitions of [n] having no pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =25a(6) =84a(7) =323a(8) =1377a(9) =6412a(10) =32312a(11) =174941a(12) =1011357a(13) =6210298a(14) =40323011a(15) =275763910a(16) =1979709852a(17) =14875239212a(18) =116679269248a(19) =953201694216
External references
- oeis: A270954