1, 121

One
One, two, one
One, two, three, two, one
One, two, three, four, three, two, one
One, two, three, four, five, four, three, two, one
One, two, three, four, five, six, five, four, three, two, one
One, two, three, four, five, six, seven, six, five, four, three, two, one
One, two, three, four, five, six, seven, eight, seven, six, five, four, three, two, one.