One possible answer, based on polynomial functions is
Un = (8n5 - 140n4 + 920n3 - 2800n2 + 3887n - 1860)/15 for n = 1, 2, 3, ...
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the next number is six (6) the pattern is: add five, subtract seven. 5+5=10 10-7=3 5+3=8 8-7=1 1+5= *6*
6 3 48 3 10 4 3 1 ? 5 6
It is 1 9 2 8 3 7 4 6 5 5 : 1 + 9 = 10 2 + 8 = 10 3 + ? = 10 ----> 3 + 7 = 10
1 10 2 9 3 8 4 7 5 6 6 5 7 4 8 3 9 2 10 1
3/5 - 1/10 --> 6/10 - 1/10 = 5/10 = 1/2.