Number of set partitions of {1,2,...,n} having no blocks of the form {i,i+1,i+2}.
A184177
Number of set partitions of {1,2,...,n} having no blocks of the form {i,i+1,i+2}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =46a(6) =184a(7) =805a(8) =3840a(9) =19775a(10) =109180a(11) =642382a(12) =4007712a(13) =26399764a(14) =182939900a(15) =1329327991a(16) =10100670183a(17) =80053631844a(18) =660328296777
External references
- oeis: A184177