# A005348 (b-file synthesized from sequence entry) 1 1 2 2 3 5 4 13 5 33 6 81 7 193 8 449 9 1089 10 2673 11 6561 12 15633 13 37249 14 88209 15 216513 16 531441 17 1266273 18 3017169 19 7189057 20 17537553 21 43046721 22 102568113 23 244390689 24 582313617 25 1420541793 26 3486784401 27 8308017153 28 19795645809 29 47167402977 30 115063885233 31 282429536481