# A371044 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 6 4 24 5 60 6 120 7 5250 8 80976 9 726264 10 4839120 11 86487390 12 2283242280 13 42585905076 14 590667519624 15 10115535833130 16 286758920451360 17 8128299117822960 18 186279550983756576 19 4123388294626654134 20 118916807955913504440 21 4102548791571529697580