# A083592 (b-file synthesized from sequence entry) 0 1 1 4 2 16 3 64 4 256 5 1025 6 4095 7 16395 8 65545 9 262250 10 1048875 11 4195700 12 16782525 13 67130375 14 268521500 15 1074085000 16 4296343625 17 17185365000 18 68741481250 19 274965882500 20 1099863606875 21 4399454303125 22 17597817384375 23 70391269365625