# A200539 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 45 5 168 6 663 7 2667 8 10982 9 45925 10 194732 11 834912 12 3614063 13 15771795 14 69316740 15 306534564 16 1362986799 17 6089916936 18 27328613142 19 123118156260 20 556626199974 21 2524659817449 22 11484671681511 23 52384730922720 24 239534402969925 25 1097805759803893 26 5042014405418968