# A022445 (b-file synthesized from sequence entry) 0 1 1 0 2 4 3 10 4 34 5 94 6 222 7 516 8 1202 9 2738 10 6110 11 13496 12 29586 13 64350 14 139006 15 298636 16 638578 17 1359754 18 2884638 19 6099552 20 12859730 21 27040694 22 56723774 23 118732340 24 248034354 25 517208034 26 1076694622 27 2237946376 28 4645007122