A375996 Number of integers y > 0 such that y < (n/2+x)*sqrt(3) and y < (n/2-x)*sqrt(3).

0, 1, 2, 5, 8, 13, 18, 24, 31, 38, 47, 56, 67, 78, 90, 103, 116, 131, 146, 163, 180, 199, 217, 238, 257, 280, 301, 326, 349, 375, 400, 427, 454, 483, 512, 543, 574, 606, 639, 672, 707, 742, 779, 816, 854, 893, 932, 973, 1014, 1057, 1100, 1145, 1189, 1236, 1281

Offset: 1

Author

Jean-Marc Rebert, Sep 05 2024

Keywords

• nonn

Comments

Also number of integer coordinates of points inside an equilateral triangle with side length n, where one vertex is on the y-axis (Oy) and the other two vertices are on the x-axis (Ox).

Crossrefs

Cf. A362873.