# A049974 (b-file synthesized from sequence entry) 1 1 2 3 3 3 4 8 5 18 6 34 7 70 8 140 9 285 10 563 11 1128 12 2256 13 4517 14 9044 15 18104 16 36244 17 72558 18 144977 19 289956 20 579912 21 1159829 22 2319668 23 4639352 24 9278740 25 18557550 26 37115245 27 74230768 28 148462101 29 296925330 30 593852921 31 1187710369 32 2375429798