# A346292 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 4 4 36 5 576 6 17600 7 694800 8 35802144 9 2391438336 10 200018045952 11 20476348214400 12 2521840589347200 13 368057828019898368 14 62841061478699292672 15 12413136137144581203456 16 2809529229255558769612800 17 722458985698006017844838400 18 209487621780682072569567903744