# A019486 (b-file synthesized from sequence entry) 0 2 1 5 2 12 3 28 4 65 5 150 6 346 7 795 8 1826 9 4192 10 9621 11 22078 12 50660 13 116239 14 266704 15 611930 16 1404013 17 3221358 18 7391048 19 16957921 20 38908004 21 89269924 22 204819503 23 469934590 24 1078210352 25 2473828397 26 5675911794 27 13022719964