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A026685
T(2n-1,n-1), T given by A026681.
0
1, 5, 17, 87, 324, 1707, 6595, 35300, 139114, 751901, 3000177, 16322561, 65684626, 359049028, 1453825024, 7975236698, 32444454286, 178473218093, 728737293093, 4017589328269, 16453338330248, 90873261482607, 373067000217563
OFFSET
1,2
CROSSREFS
Sequence in context: A149757 A153499 A012782 * A089923 A374292 A145041
KEYWORD
nonn
STATUS
approved