# A151276 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 17 4 69 5 273 6 1181 7 5049 8 22277 9 98801 10 445357 11 2019337 12 9240325 13 42516417 14 196833789 15 915399225 16 4276244117 17 20050107057 18 94335358413 19 445185708105 20 2106762523813 21 9994758390849 22 47525328431357 23 226456780880985 24 1081142185822101 25 5170719824783825 26 24770430475804429 27 118844354630579049