# A012541 (b-file synthesized from sequence entry) 0 0 1 2 2 8 3 320 4 15808 5 1671808 6 242521600 7 52294963968 8 14823920529408 9 5496196568825856 10 2548323017071149056 11 1453790822661022908416 12 997862723859007908085760 13 812410035086507459409412096