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.

1, 3, 7, 13, 25, 36, 62, 78, 126, 152, 244, 266, 419, 423, 637, 679, 932, 1007, 1307, 1419, 1697, 1918, 2229, 2514, 2899, 3300, 3672, 4223, 4663, 5298, 5682, 6495, 6988, 7619, 8324, 9289, 9861, 11033, 11697, 12812, 13727, 14956, 16008, 17298, 18473, 19701, 21186, 22502

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Comments

a(n) is the sum of the terms of the n-th antidiagonal of triangle A026098. - Sean A. Irvine, Sep 16 2019

Extensions

a(11) onward corrected and more terms from Sean A. Irvine, Sep 16 2019