# A126923 (b-file synthesized from sequence entry) 0 1 1 33 2 561 3 6534 4 58542 5 429726 6 2688741 7 14734797 8 72139188 9 320292159 10 1304830527 11 4923228882 12 17335268874 13 57322733226 14 178956174243 15 529880976603 16 1494051617256 17 4025876961117 18 10400637791973 19 25836376187094 20 61877364279654 21 143225155573038