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A055991
a(n) is its own 4th difference.
+0
8
1, 5, 19, 69, 250, 907, 3292, 11949, 43371, 157422, 571388, 2073943, 7527704, 27322992, 99173120, 359964521, 1306548149, 4742323107, 17213011605, 62477347458, 226771411939, 823102698260, 2987581397893, 10843899100203
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Maintained by
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Last modified December 6 11:04 EST 2009. Contains 170427 sequences.
AT&T Labs Research
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