# A148686 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 22 5 67 6 228 7 775 8 2787 9 10096 10 37692 11 142300 12 546739 13 2124319 14 8349915 15 33135509 16 132647446 17 535088379 18 2174051788 19 8887400681 20 36550977240 21 151088635064 22 627703523526 23 2619294449873 24 10975951665533 25 46172369684781 26 194925589213610 27 825737811918024 28 3508786527526401