Least entry in a 2-composition of n, summed over 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.
A181366
Least entry in a 2-composition of n, summed over 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) =1a(2) =2a(3) =5a(4) =10a(5) =20a(6) =38a(7) =74a(8) =144a(9) =282a(10) =552a(11) =1086a(12) =2144a(13) =4247a(14) =8430a(15) =16761a(16) =33364a(17) =66479a(18) =132566a(19) =264520a(20) =528078a(21) =1054636a(22) =2106854a(23) =4209853a(24) =8413548a(25) =16817253a(26) =33618758a(27) =67212301a(28) =134384182a(29) =268703498
External references
- oeis: A181366