HTML RESULT 
{sequence 25, push='mySequence'}
{pull mySequence, make,   octagonal} {$sequence} {/pull}
1 8 21 40 65 96 133 176 225 280 341 408 481 560 645 736 833 936 1045 1160 1281 1408 1541 1680 1825
{pull mySequence, keep,   octagonal} {$sequence} {/pull}
1 8 21
{pull mySequence, remove, octagonal} {$sequence} {/pull}
2 3 4 5 6 7 9 10 11 12 13 14 15 16 17 18 19 20 22 23 24 25
{pull mySequence, flag,   octagonal} {$sequence} {/pull}
1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0