Number of 0's in all 2-compositions of n. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.
A181294
Number of 0's in all 2-compositions of n. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.
Terms
- a(0) =0a(1) =2a(2) =10a(3) =46a(4) =198a(5) =816a(6) =3264a(7) =12776a(8) =49192a(9) =186976a(10) =703328a(11) =2623072a(12) =9712864a(13) =35746816a(14) =130873088a(15) =476961920a(16) =1731331200a(17) =6262393344a(18) =22580421120a(19) =81188953600a(20) =291176175104
External references
- oeis: A181294