# A036292 (b-file synthesized from sequence entry) 0 0 1 6 2 72 3 648 4 5184 5 38880 6 279936 7 1959552 8 13436928 9 90699264 10 604661760 11 3990767616 12 26121388032 13 169789022208 14 1097098297344 15 7052774768640 16 45137758519296 17 287753210560512 18 1828079220031488 19 11577835060199424 20 73123168801259520 21 460675963447934976