# A026088 (b-file synthesized from sequence entry) 1 1 2 3 3 8 4 52 5 294 6 1691 7 9736 8 56277 9 326430 10 1899530 11 11085360 12 64857925 13 380331474 14 2234804775 15 13155328400 16 77565394650 17 458003596050 18 2707970743326 19 16030265384752 20 94997726453172