# A057268 (b-file synthesized from sequence entry) 0 1 1 3 2 6 3 18 4 216 5 42768 6 1819863936 7 3311826913612597248 8 10968197499701667312529793029329125376 9 120301356392461906290006219878693096559247086148184247242087281541542576128