Number of set partitions of [n] having exactly three pairs (m,m+1) such that m is in some block b and m+1 is in block b+1.
A271790
Number of set partitions of [n] having exactly three pairs (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) =10a(3) =61a(4) =313a(5) =1520a(6) =7373a(7) =36627a(8) =188396a(9) =1007708a(10) =5612677a(11) =32551400a(12) =196447095a(13) =1232448403a(14) =8028591686a(15) =54240974862a(16) =379574487845
External references
- oeis: A271790