# A176953 (b-file synthesized from sequence entry) 0 1 1 1 2 -1 3 -5 4 -17 5 -49 6 -129 7 -305 8 -609 9 -801 10 735 11 10911 12 53983 13 203551 14 651487 15 1796639 16 4084447 17 6188831 18 -4060449 19 -84814049 20 -455815457 21 -1824908513 22 -6141218081 23 -17711864033 24 -42059573537 25 -67468774625 26 33608030943