# A104169 (b-file synthesized from sequence entry) 1 4 2 27 3 378 4 576 5 2688 6 17496 7 44928 8 75776 9 168960 10 319488 11 958464 12 2883584 13 5767168 14 7077888 15 279969792 16 544997376 17 778567680 18 2579496960 19 3875536896 20 22749904896 21 60699967488 22 87509958656 23 164886478848