# A148673 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 21 5 62 6 201 7 633 8 2067 9 6768 10 22871 11 77198 12 264384 13 906396 14 3145281 15 10935879 16 38320745 17 134570558 18 475469721 19 1683213060 20 5986055526 21 21332299530 22 76302127859 23 273399809978 24 982457173368 25 3536666364440 26 12763021685504 27 46129366899456 28 167062177027460 29 605905478203148 30 2201414194403001