# A025571 (b-file synthesized from sequence entry) 1 1 2 3 3 19 4 140 5 1090 6 8749 7 71604 8 593997 9 4976785 10 42016975 11 356879250 12 3046096983 13 26105109424 14 224485080580 15 1936029865870 16 16738879226139 17 145041018993018 18 1259189426140919 19 10950454909118725 20 95374995078513150 21 831822673255797630 22 7263789225782699928