# A148489 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 21 5 73 6 272 7 1055 8 4226 9 17296 10 72002 11 304223 12 1302487 13 5631257 14 24557910 15 107912037 16 477269006 17 2122877159 18 9489677428 19 42608326043 20 192070741414 21 868890650080 22 3943246247910 23 17947364156580 24 81901112293463 25 374647230094154 26 1717560685555588 27 7890073413521769 28 36312976830040510