Find the rules: 7 in the first line, 19 in the second line, 37 in the third line, how many in the sixth line, and how many in the nth line

19-7=12 37-19=18 61-37=24
It can be seen that the difference of the sequence is an arithmetic sequence, and the differences are in turn multiples of 6,
12.18.24 followed by 30.36
61 + 30 = 91 + 36 = 127 the sixth line is 127
Line n is 7 + 6 * (2 + 3 +... + n) = 3N ^ 2 + 3N + 1

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