# A353186 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 22 4 170 5 1588 6 18236 7 240840 8 3662424 9 62456136 10 1185150768 11 24714979584 12 562659843984 13 13870798275072 14 368324715871680 15 10478253239415552 16 317975367247809408 17 10252138622419702656 18 349999438215928660992 19 12612365665457524786944 20 478414908509124826439424