5 / 4, 29 / 9, 83 / 16, 180 / 25, 331 / 366 find the general formula of this group of numbers or tell the law of this group of numbers The last number is 331 / 36. If you are interested, I will give you a bonus

5 / 4, 29 / 9, 83 / 16, 180 / 25, 331 / 366 find the general formula of this group of numbers or tell the law of this group of numbers The last number is 331 / 36. If you are interested, I will give you a bonus

1+1/4
3+2/9
5+3/16
7+5/25
9+7/36
an=(2n-1)+[3n/2+Sin(nπ/2)/2-1]/(n+1)^2
I admit that the law is not convincing