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A118103
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First differences contain a(n) n's, in order, starting with a(0)=1.
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2
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1, 1, 2, 4, 6, 9, 12, 15, 18, 22, 26, 30, 34, 38, 42, 47, 52, 57, 62, 67, 72, 77, 82, 87, 93, 99, 105, 111, 117, 123, 129, 135, 141, 147, 153, 159, 166, 173, 180, 187, 194, 201, 208, 215, 222, 229, 236, 243, 250, 257, 264, 272, 280, 288, 296, 304, 312, 320, 328, 336
(list; graph; refs; listen; history; internal format)
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