# A012834 (b-file synthesized from sequence entry) 0 1 1 2 2 40 3 1192 4 87680 5 9890432 6 1736725120 7 424537276672 8 139089326735360 9 58613115790118912 10 30905365440751206400 11 19924657840958605361152 12 15419390055940961625866240 13 14105236549373087746555707392