A023544 Convolution of natural numbers with A014306.
0, 1, 3, 5, 8, 12, 17, 23, 30, 37, 45, 54, 64, 75, 87, 100, 114, 129, 145, 161, 178, 196, 215, 235, 256, 278, 301, 325, 350, 376, 403, 431, 460, 490, 520, 551, 583, 616, 650, 685, 721, 758, 796, 835, 875, 916, 958, 1001, 1045, 1090, 1136, 1183
Offset: 1