# A183115 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 7 4 19 5 55 6 159 7 471 8 1403 9 4191 10 12551 11 37615 12 112787 13 338279 14 1014703 15 3043911 16 9131435 17 27393839 18 82180823 19 246541407 20 739622595 21 2218865335 22 6656592255 23 19969771063 24 59909304539 25 179727900415 26 539183681191 27 1617551013071 28 4852652992755 29 14557958907655 30 43673876615503