# A129817 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 1 4 2 5 6 6 24 7 102 8 528 9 2952 10 19008 11 131112 12 1009728 13 8271792 14 74167488 15 703077552 16 7194754368 17 77437418112 18 890643066048 19 10726837356672 20 136988469649728 21 1825110309733632 22 25625477737660608 23 374159217291201792 24 5728724202727533888 25 90961591766739121152 26 1508303564683904357568 27 25874345243221479539712 28 461932949559928514787648 29 8513674175717969079785472 30 162818666826944872460200128