human
Count a number of objects \[
1,3,6,10, \ldots \text { ? }
\]

Which pattern matches the sequence above? ![A sequence represented using red circles arranged in a pattern so that the first term has one red dot and then an additional two dots are added underneath this one red dot for the second term. For the third term another two red dots are added underneath and for the fourth term, two more added underneath the previous pattern.]()
gpt
Uses only the first two terms of a sequence to work out a term-to-term rule