# A183111 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 9 4 25 5 75 6 223 7 665 8 1993 9 5971 10 17903 11 53697 12 161065 13 483163 14 1449439 15 4348233 16 13044585 17 39133571 18 117400431 19 352200881 20 1056601993 21 3169805003 22 9509413535 23 28528238329 24 85584711561 25 256754129459 26 770262380399 27 2310787129121 28 6932361368937