# A090411 (b-file synthesized from sequence entry) 0 1 1 15 2 240 3 3840 4 61440 5 983040 6 15728640 7 251658240 8 4026531840 9 64424509440 10 1030792151040 11 16492674416640 12 263882790666240 13 4222124650659840 14 67553994410557440 15 1080863910568919040 16 17293822569102704640 17 276701161105643274240 18 4427218577690292387840