# A149088 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 7 4 30 5 75 6 323 7 927 8 4084 9 12757 10 57357 11 190323 12 863932 13 2990215 14 13742390 15 49151253 16 227407578 17 834395673 18 3888507313 19 14572098227 20 68261017116 21 260231521603 22 1224649653002 23 4738562044311 24 22388087279914 25 87710572097589 26 415756729437735 27 1646822285537643 28 7829736984834466