# A059099 (b-file synthesized from sequence entry) 0 1 1 2 2 7 3 33 4 198 5 1453 6 12669 7 128320 8 1482721 9 19260421 10 277913552 11 4410640919 12 76360030701 13 1432144732762 14 28926138244883 15 625974400305541 16 14449445989893990 17 354384475357492593 18 9202837263156670345 19 252260867710562944224 20 7278710072406887897461