# A261584 (b-file synthesized from sequence entry) 0 1 1 4 2 12 3 36 4 92 5 228 6 540 7 1236 8 2748 9 6004 10 12876 11 27252 12 57036 13 118308 14 243564 15 498564 16 1015484 17 2060484 18 4167804 19 8409588 20 16934748 21 34049940 22 68378220 23 137185428 24 275026476 25 551052676 26 1103618508 27 2209525092 28 4422484764 29 8850120420 30 17707920924