# A103435 (b-file synthesized from sequence entry) 0 0 1 2 2 4 3 16 4 48 5 160 6 512 7 1664 8 5376 9 17408 10 56320 11 182272 12 589824 13 1908736 14 6176768 15 19988480 16 64684032 17 209321984 18 677380096 19 2192048128 20 7093616640 21 22955425792 22 74285318144 23 240392339456 24 777925951488 25 2517421260800