# A049602 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 5 4 9 5 30 6 68 7 195 8 483 9 1309 10 3355 11 8900 12 23112 13 60813 14 158717 15 416325 16 1088661 17 2852242 18 7463884 19 19546175 20 51163695 21 133962621 22 350695511 23 918170280 24 2403740304 25 6293172025 26 16475579353 27 43133883845 28 112925557953