# A103457 (b-file synthesized from sequence entry) 0 1 1 4 2 10 3 28 4 82 5 244 6 730 7 2188 8 6562 9 19684 10 59050 11 177148 12 531442 13 1594324 14 4782970 15 14348908 16 43046722 17 129140164 18 387420490 19 1162261468 20 3486784402 21 10460353204 22 31381059610 23 94143178828 24 282429536482 25 847288609444