Number of set partitions of [n] having exactly one pair (m,m+1) such that m is in some block b and m+1 is in block b+1.
A271788
Number of set partitions of [n] having exactly one pair (m,m+1) such that m is in some block b and m+1 is in block b+1.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =7a(4) =16a(5) =39a(6) =105a(7) =314a(8) =1035a(9) =3723a(10) =14494a(11) =60670a(12) =271544a(13) =1293147a(14) =6523495a(15) =34724247a(16) =194357190a(17) =1140402612a(18) =6995760364a(19) =44760085240a(20) =298054873358
External references
- oeis: A271788