# A160181 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 7 5 18 6 59 7 221 8 936 9 4361 10 22083 11 120336 12 700653 13 4333933 14 28345090 15 195233255 16 1411303635 17 10675375402 18 84276173439 19 692752181561 20 5917018378496 21 52416910416933 22 480786834535247 23 4559132648864256