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

1,2

Comments

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

Links

Table of n, a(n) for n=1..48.

Crossrefs

Sequence in context: A309051 A056764 A360783 * A328652 A301854 A092463

Adjacent sequences: A026100 A026101 A026102 * A026104 A026105 A026106

Keyword

nonn

Author

Clark Kimberling

Extensions

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

Status

approved