# A156438 (b-file synthesized from sequence entry) 2 2 3 0 4 22 5 7 6 232 7 270 8 9312 9 40416 10 1578064 11 10491480 12 534495232 13 4186295040 14 266388662656 15 2380048630848 16 182963339479264 17 1839487795001024 18 166774503916789696 19 1865501254974930048 20 195842622547532763968