# A046989 (b-file synthesized from sequence entry) 0 1 1 6 2 180 3 2835 4 37800 5 467775 6 3831077250 7 127702575 8 2605132530000 9 350813659321125 10 15313294652906250 11 147926426347074375 12 2423034863565078262500 13 144228265688397515625 14 3952575621190533915703125 15 84913182070036240111050234375 16 999843529136357459316262500000