# A045889 (b-file synthesized from sequence entry) 0 1 1 7 2 30 3 102 4 303 5 825 6 2116 7 5200 8 12381 9 28779 10 65658 11 147594 12 327835 13 721069 14 1573056 15 3408084 16 7340265 17 15728895 18 33554710 19 71303470 20 150995271 21 318767457 22 671089020 23 1409286552 24 2952790453 25 6174015955 26 12884902386