a(n) = Sum_{k=m..n} T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027935.

A027947

a(n) = Sum_{k=m..n} T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027935.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =7a(6) =9a(7) =15a(8) =21a(9) =32a(10) =48a(11) =70a(12) =107a(13) =156a(14) =236a(15) =349a(16) =521a(17) =778a(18) =1155a(19) =1728a(20) =2567a(21) =3833a(22) =5707a(23) =8505a(24) =12680a(25) =18884a(26) =28158a(27) =41943a(28) =62520a(29) =93160

External references