# A016256 (b-file synthesized from sequence entry) 0 1 1 18 2 235 3 2700 4 28981 5 298278 6 2984095 7 29253600 8 282456361 9 2695498938 10 25486623955 11 239196683700 12 2231306698141 13 20710052641998 14 191416812647815 15 1762962024789000 16 16188343910770321 17 148268580698287458 18 1355005110295423675 19 12359749064745505500