# A158827 (b-file synthesized from sequence entry) 1 1 2 4 3 20 4 110 5 640 6 3870 7 24084 8 153306 9 993978 10 6544242 11 43652340 12 294469974 13 2006018748 14 13784115468 15 95444016984 16 665407010349 17 4667570034444 18 32922870719664 19 233389493503968 20 1662048903052380 21 11885333877149532