a(n) = Sum_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is the n-th diagonal sum of left-justified array T given by A026998.
A027010
a(n) = Sum_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is the n-th diagonal sum of left-justified array T given by A026998.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =6a(5) =13a(6) =17a(7) =29a(8) =43a(9) =64a(10) =100a(11) =144a(12) =223a(13) =326a(14) =492a(15) =733a(16) =1089a(17) =1634a(18) =2421a(19) =3626a(20) =5389a(21) =8041a(22) =11985a(23) =17847a(24) =26624a(25) =39640a(26) =59112a(27) =88059a(28) =131242a(29) =195592
External references
- oeis: A027010