# A163175 (b-file synthesized from sequence entry) 0 1 1 25 2 600 3 14400 4 345300 5 8280000 6 198547500 7 4761000000 8 114164729700 9 2737573095600 10 65644673871900 11 1574103433035600 12 37745661174674100 13 905108843301991200 14 21703740051934476300 15 520437222249938431200