It is wrong to refuse any involvement in my biological child's life?

Some years back I had a contraceptive malfunction, and a child was conceived as a result. I offered to pay for an abortion but the woman refused. The child was born, and the mother and child moved away. I voluntarily pay child support, but I have no desire to be part of the child's life. I never wanted to be a father nor do I want to now. Am I right -- morally and legally -- to take this stance?