# A067406 (b-file synthesized from sequence entry) 0 1 1 11 2 396 3 14256 4 513216 5 18475776 6 665127936 7 23944605696 8 862005805056 9 31032208982016 10 1117159523352576 11 40217742840692736 12 1447838742264938496 13 52122194721537785856 14 1876399009975360290816 15 67550364359112970469376 16 2431813116928066936897536 17 87545272209410409728311296