1,2

a(n) = a(n-1) + q^{(n-1)} = {(q^n - 1) / (q - 1)}

Adjacent sequences: A014988 A014989 A014990 this_sequence A014992 A014993 A014994

Sequence in context: A001799 A058068 A096873 this_sequence A015577 A082764 A024104

sign,easy

Olivier Gerard (olivier.gerard(AT)gmail.com)