# A076883 (b-file synthesized from sequence entry) 1 1 2 2 3 5 4 12 5 30 6 75 7 187 8 467 9 1167 10 2917 11 7292 12 18230 13 45575 14 113937 15 284842 16 712105 17 1780262 18 4450655 19 11126637 20 27816592 21 69541480 22 173853700 23 434634250 24 1086585625 25 2716464062 26 6791160155 27 16977900387 28 42444750967 29 106111877417