# A148603 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 20 5 58 6 198 7 642 8 2350 9 8252 10 31002 11 114202 12 442764 13 1686722 14 6668388 15 26057670 16 104922324 17 417908598 18 1705897816 19 6903301784 20 28520655252 21 116886258244 22 487649280536 23 2020521857872 24 8502203299742 25 35550032694088 26 150682339656654 27 635129679380712 28 2709469220124966