# A081546 (b-file synthesized from sequence entry) 0 2 1 5 2 17 3 97 4 257 5 3457 6 12289 7 40961 8 65537 9 786433 10 5308417 11 14155777 12 104857601 13 167772161 14 1811939329 15 3221225473 16 24159191041 17 77309411329 18 206158430209 19 2061584302081 20 2748779069441 21 6597069766657 22 39582418599937