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A115324
Central terms of the rows of triangle A115323.
1
1, 1, 2, 4, 9, 22, 55, 141, 371, 997, 2712, 7440, 20542, 57056, 159343, 447045, 1259443, 3561529, 10119910, 28892841, 82727805, 237322575, 681862156, 1961930899, 5653182325, 16312268162, 47133250093, 136366337701
OFFSET
0,3
COMMENTS
Limit a(n+1)/a(n) = 3.
CROSSREFS
Sequence in context: A290996 A373245 A198520 * A196307 A107092 A352702
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jan 20 2006
STATUS
approved