# A000388 (b-file synthesized from sequence entry) 4 6 5 20 6 180 7 1106 8 9292 9 82980 10 831545 11 9139482 12 109595496 13 1423490744 14 19911182207 15 298408841160 16 4770598226296 17 81037124739588 18 1457607971046492 19 27675791180024802 20 553166885187641670 21 11609691036091870428 22 255273744004170486155 23 5868308906885934514178