Doubly restricted composition numbers: number of compositions of floor(n(n+2)/2) into exactly n positive integers each no more than n+1.
A077047
Doubly restricted composition numbers: number of compositions of floor(n(n+2)/2) into exactly n positive integers each no more than n+1.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =12a(4) =85a(5) =780a(6) =9331a(7) =134512a(8) =2306025a(9) =45433800a(10) =1018872811a(11) =25506741084a(12) =707972099627
External references
- oeis: A077047