# A071749 (b-file synthesized from sequence entry) 0 1 1 4 2 14 3 48 4 166 5 578 6 2029 7 7182 8 25623 9 92078 10 333064 11 1211896 12 4433175 13 16294856 14 60155235 15 222950730 16 829284435 17 3094726590 18 11583668940 19 43478013360 20 163606061280 21 617094776844 22 2332666266954 23 8835573652892