# A055531 (b-file synthesized from sequence entry) 2 2 3 12 4 86 5 840 6 11642 7 227892 8 6285806 9 243593040 10 13262556722 11 1014466283292 12 109128015915206 13 16521353903210520 14 3524056001906654762 15 1059868947134489801412 16 449831067019305308555486 17 269568708630308018001547680 18 228228540531327778410439620962