# A148693 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 23 5 67 6 237 7 805 8 2885 9 10445 10 39679 11 148885 12 573215 13 2242027 14 8857871 15 35069977 16 141098599 17 572026433 18 2327192345 19 9529746879 20 39375349267 21 163259808875 22 679323714809 23 2843675504507 24 11960396769469 25 50428215090523 26 213406038719425 27 907014855445347 28 3865740278475333