# A027455 (b-file synthesized from sequence entry) 2 15 3 65 4 175 5 9963 6 5368 7 1105000 8 5720625 9 105686875 10 75492928 11 74269960128 12 56445795000 13 96454009575000 14 76498373160000 15 61692439558464 16 403805999193597 17 1643804692663258125 18 1377243480733120000