# A047101 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 5 4 10 5 20 6 37 7 70 8 140 9 280 10 544 11 1065 12 2130 13 4260 14 8418 15 16684 16 33368 17 66736 18 132760 19 264436 20 528872 21 1057744 22 2110233 23 4212350 24 8424700 25 16849400 26 33658512 27 67254158 28 134508316 29 269016632 30 537715716 31 1074932056 32 2149864112