# A025959 (b-file synthesized from sequence entry) 0 1 1 18 2 209 3 1998 4 17157 5 137970 6 1063273 7 7962966 8 58471853 9 423482202 10 3037367697 11 21634921854 12 153344743189 13 1083048862914 14 7630057197881 15 53656123623462 16 376830071424765 17 2644030889883306 18 18539455617424225