# A353993 (b-file synthesized from sequence entry) 0 1 1 1 2 8 3 63 4 668 5 7850 6 115914 7 1847286 8 34031024 9 682177464 10 15049816200 11 357564279600 12 9212847784392 13 252552128708568 14 7395084613746816 15 229412209982127480 16 7524339637608261120 17 259675490280634374720 18 9418707076419411194304 19 357606237255136232451264