# A148769 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 21 5 68 6 214 7 677 8 2273 9 7647 10 25918 11 89348 12 311027 13 1088056 14 3829653 15 13588462 16 48394968 17 172944341 18 621204971 19 2238314211 20 8085624821 21 29299373131 22 106444414667 23 387514343973 24 1413668394353 25 5167606834130 26 18922163532610 27 69393623143969 28 254887907279952 29 937530482411295 30 3452720455224744