# A318537 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 0 4 0 5 6 6 6 7 0 8 0 9 6 10 174 11 840 12 2520 13 5040 14 5040 15 0 16 0 17 0 18 840 19 24360 20 335160 21 3553200 22 32382000 23 259459200 24 1816214400 25 10897286400 26 54486432000 27 217945728000 28 653837184000 29 1307674368000 30 1307674368000 31 0 32 0 33 0 34 2520 35 335160 36 15198120 37 476496720 38 12767000400 39 314181504000 40 7288444800000