a(n) = T(n,1) + T(n-1,2) + ...+ T(n-k+1,k), where k = floor((n+1)/2) and T is the array defined in A026098.

A026103

a(n) = T(n,1) + T(n-1,2) + ...+ T(n-k+1,k), where k = floor((n+1)/2) and T is the array defined in A026098.

Terms

    a(0) =1a(1) =3a(2) =7a(3) =13a(4) =25a(5) =36a(6) =62a(7) =78a(8) =126a(9) =152a(10) =244a(11) =266a(12) =419a(13) =423a(14) =637a(15) =679a(16) =932a(17) =1007a(18) =1307a(19) =1419a(20) =1697a(21) =1918a(22) =2229a(23) =2514a(24) =2899a(25) =3300a(26) =3672a(27) =4223a(28) =4663a(29) =5298

External references