If you happen to be English speaking, it is the names of the digits in alphabetical order.
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It is the start of an arithmetic sequence.
If 1,2,3,4,5, is a sequence, then the sum is 1+2+3+4+5 = 15
36 Seems like: 1 4 9 16 25 is squared sequence: 1 2 3 4 5 So 6 squared will be 36.
It works out as -5 for each consecutive term
The sequence is just each number is the square of 1 to 5 1 squared is 1 2squared is 4 3squared is 9 ect so the 99th number will be 99 squared which is 9801