# A138269 (b-file synthesized from sequence entry) 0 1 1 3 2 12 3 53 4 231 5 1000 6 4329 7 18747 8 81188 9 351597 10 1522639 11 6594000 12 28556241 13 123666803 14 535556412 15 2319302053 16 10044062391 17 43497219000 18 188370799289 19 815766130347 20 3532789487188 21 15299239691997