Doubly restricted composition numbers: number of compositions of 1+2+3+...+n = n(n+1)/2 into exactly n positive integers each no more than n.
A077045
Doubly restricted composition numbers: number of compositions of 1+2+3+...+n = n(n+1)/2 into exactly n positive integers each no more than n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =44a(5) =381a(6) =4332a(7) =60691a(8) =1012664a(9) =19610233a(10) =432457640a(11) =10701243741a(12) =293661065788
External references
- oeis: A077045