# A011964 (b-file synthesized from sequence entry) 1 0 2 3 3 5 4 18 5 38 6 100 7 198 8 445 9 829 10 1605 11 2851 12 5014 13 8361 14 13843 15 21907 16 34362 17 52327 18 78571 19 115434 20 167695