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A027947 a(n) = Sum{T(k,n-k)}, k = m,m+1,...,n, where m=[ (n+1)/2 ]; a(n) is the n-th diagonal-sum of left justified array T given by A027935. 0

%I

%S 1,1,2,3,4,7,9,15,21,32,48,70,107,156,236,349,521,778,1155,1728,2567,

%T 3833,5707,8505,12680,18884,28158,41943,62520,93160,138825,206897,

%U 308290,459459,684652,1020311,1520473,2265815,3376605

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

%F G.f.: (x+1)/(x^4-x^3-2x^2+1).

%K nonn

%O 0,3

%A _Clark Kimberling_

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Last modified June 26 20:19 EDT 2019. Contains 324380 sequences. (Running on oeis4.)