a(n) = Sum_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is n-th diagonal sum of left-justified array T given by A027011.
A027022
a(n) = Sum_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is n-th diagonal sum of left-justified array T given by A027011.
Terms
- a(0) =1a(1) =3a(2) =4a(3) =7a(4) =11a(5) =15a(6) =26a(7) =34a(8) =57a(9) =79a(10) =123a(11) =181a(12) =269a(13) =406a(14) =597a(15) =900a(16) =1332a(17) =1991a(18) =2968a(19) =4414a(20) =6596a(21) =9805a(22) =14639a(23) =21792a(24) =32488a(25) =48418a(26) =72130a(27) =107532a(28) =160191a(29) =238776
External references
- oeis: A027022