# A012144 (b-file synthesized from sequence entry) 0 1 1 1 2 17 3 769 4 66849 5 9506241 6 2007271089 7 589807203777 8 230194642564161 9 115219444193968257 10 71962921603647030609 11 54865853223458268869505 12 50151129904368572197783905 13 54139213630083955379966633025