# A213323 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 0 5 44 6 304 7 2568 8 26704 9 200240 10 1931616 11 20849696 12 246556672 13 3300906816 14 46382446720 15 695413794944 16 11120648673024 17 188600719094528 18 3394592207824384 19 64513420630110720 20 1290420198709682176 21 27102196040419214336 22 596237419436696543232 23 13713106494042086045696