The next number is 1.
The simplest polynomial rule is
Un = (-15n4 + 202n3 - 921n2 + 1646n - 888)/24 for n = 1, 2, 3, ...
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12110 0r 1210
The next number is 12. The rule is Un = (2n4 - 27n3 + 123n2 - 214n + 120)/2 for n = 1, 2, 3, ...
The next four number in the sequence are... 4,5,5 & 6
what are the next 2 numbers in this sequence: 20 , 1 ,18 ,4 ,9 ,1
20