It can be any number you like. Given any number, it is always possible to find a polynomial of degree 5 that will fit the above numbers and the give sixth number. The only polynomial of order 4 is
Un =(-n4 - 6n3 + 85n2 - 174n + 144)/24 for n = 1, 2, 3, ...
This gives the next term as -18.
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1+1=2 : 1+2=3 : 2+3=5 : 3+5=8Therefore the next number is 8
16
21
Consecutive terms in the sequence are being divided by -2. Therefore, -1 / -2 = 1/2 or 0.5.
21. Add the last 2 numbers to get the next.