# A007822 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 9 5 28 6 89 7 287 8 935 9 3072 10 10157 11 33767 12 112736 13 377836 14 1270203 15 4282311 16 14470629 17 49005732 18 166261653 19 565055147 20 1923186472 21 6554868916 22 22367933148 23 76417819396 24 261335128098 25 894597454360 26 3064970675173