A115759 a(n) is the sum of terms in the n-th row of triangle A115758.

0, 1, 4, 7, 14, 19, 28, 34, 45, 53, 72, 80, 96, 105, 119, 139, 168, 179, 213, 234, 248, 269, 312, 327, 363, 391, 430, 452, 493, 530, 570, 593, 645, 677, 732, 756, 801, 844, 885, 922, 981, 1019, 1100, 1137, 1188, 1224, 1283, 1344, 1397, 1463, 1524, 1567, 1668