{sequence even, rows=5} {$sequence} {/sequence}
2 4 6 8 10
{sequence perfect, rows=10} {$sequence} {/sequence}
6 28 496 8128 33550336 8589869056 137438691328 2305843008139952128
{sequence even, perfect, rows=5} {$sequence} {/sequence}
28 8128 8589869056 2305843008139952128