# A157021 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 8 5 16 6 32 7 64 8 129 9 265 10 558 11 1200 12 2613 13 5721 14 12564 15 27702 16 61419 17 136987 18 307086 19 691012 20 1559430 21 3528310 22 8003808 23 18203788 24 41504967 25 94842031 26 217147258 27 498061096 28 1144296424 29 2633227232 30 6068715880 31 14006305208