# A037731 (b-file synthesized from sequence entry) 1 2 2 11 3 55 4 278 5 1392 6 6961 7 34805 8 174028 9 870142 10 4350711 11 21753555 12 108767778 13 543838892 14 2719194461 15 13595972305 16 67979861528 17 339899307642 18 1699496538211 19 8497482691055 20 42487413455278 21 212437067276392 22 1062185336381961