# A139022 (b-file synthesized from sequence entry) 0 2 1 5 2 16 3 29 4 256 5 563 6 1024 7 1487 8 4096 9 6779 10 65536 11 124367 12 262144 13 400151 14 17179869184 15 34359339617 16 274877906944 17 515396474423 18 19807040628566084398385987584 19 39614081257132168281375501017 20 324518553658426726783156020576256 21 648997493235596321398030665669353