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A075349
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a(1) = 1; first differences follow the pattern 1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,... i.e. the next n differences are n.
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2
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1, 2, 4, 6, 9, 12, 15, 19, 23, 27, 31, 36, 41, 46, 51, 56, 62, 68, 74, 80, 86, 92, 99, 106, 113, 120, 127, 134, 141, 149, 157, 165, 173, 181, 189, 197, 205, 214, 223, 232, 241, 250, 259, 268, 277, 286, 296, 306, 316, 326, 336, 346, 356, 366, 376, 386, 397, 408
(list; graph; refs; listen; history; internal format)
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