a(n) is the number of weak compositions of n into n-1 parts in which at least one part is zero.
A350653
a(n) is the number of weak compositions of n into n-1 parts in which at least one part is zero.
Terms
- a(0) =0a(1) =2a(2) =12a(3) =52a(4) =205a(5) =786a(6) =2996a(7) =11432a(8) =43749a(9) =167950a(10) =646635a(11) =2496132a(12) =9657687a(13) =37442146a(14) =145422660a(15) =565722704a(16) =2203961413a(17) =8597496582a(18) =33578000591a(19) =131282408380a(20) =513791607399
External references
- oeis: A350653