Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most five elements and for at least one block c the smallest integer interval containing c has exactly five elements.
A320555
Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most five elements and for at least one block c the smallest integer interval containing c has exactly five elements.
Terms
- a(0) =15a(1) =64a(2) =201a(3) =585a(4) =1741a(5) =5375a(6) =16355a(7) =48601a(8) =141921a(9) =410425a(10) =1182828a(11) =3398411a(12) =9728692a(13) =27745449a(14) =78861484a(15) =223573925a(16) =632578393a(17) =1786856056a(18) =5039984789a(19) =14197033194a(20) =39945491361a(21) =112282665839a(22) =315352029653a(23) =885048266680
External references
- oeis: A320555