A026913 T(2n-1,n-2), T given by A026907.
46, 239, 993, 3927, 15327, 59613, 231733, 901220, 3507762, 13666112, 53295628, 208049127, 812931417, 3179338857, 12444969357, 48753264432, 191137360902, 749893379292, 2944059898632, 11565629920632, 45462260000880, 178803726202404
Offset: 2