HTML RESULT 
{sequence 25, push='mySequence'}
{pull mySequence, make,   hexagonal} {$sequence} {/pull}
1 6 15 28 45 66 91 120 153 190 231 276 325 378 435 496 561 630 703 780 861 946 1035 1128 1225
{pull mySequence, keep,   hexagonal} {$sequence} {/pull}
1 6 15
{pull mySequence, remove, hexagonal} {$sequence} {/pull}
2 3 4 5 7 8 9 10 11 12 13 14 16 17 18 19 20 21 22 23 24 25
{pull mySequence, flag,   hexagonal} {$sequence} {/pull}
1 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0