# A024387 (b-file synthesized from sequence entry) 1 20 2 319 3 1850 4 6962 5 20344 6 50198 7 109666 8 218483 9 404885 10 707740 11 1178937 12 1885998 13 2914945 14 4373393 15 6393898 16 9137529 17 12797693 18 17604194 19 23827533 20 31783445 21 41837686 22 54411045 23 69984609 24 89105263 25 112391425 26 140539035