# A005955 (b-file synthesized from sequence entry) 3 1 4 2 5 5 6 14 7 36 8 98 9 273 10 768 11 2197 12 6360 13 18584 14 54780 15 162672 16 486154 17 1461197 18 4413988 19 13393855 20 40807290 21 124783669 22 382842018 23 1178140280 24 3635626680 25 11247841224 26 34880346840 27 108402132544 28 337576497920 29 1053229358252 30 3291813720292