# A187658 (b-file synthesized from sequence entry) 0 1 1 2 2 24 3 516 4 16064 5 655840 6 33157240 7 1999679696 8 140128848384 9 11189643689088 10 1003005057594240 11 99725721676986240 12 10892178742891589792 13 1296379044138734510656 14 166999512859041432577280 15 23149972436862049305233280