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A080858 Triangle read by rows: T(n,k), n >=1, 0 <= k <= C(n,k), = number of n X n symmetric positive definite matrices with 2's on the main diagonal and 1's and 0's elsewhere and with w 1's above the diagonal. 8
1, 1, 1, 1, 3, 3, 1, 1, 6, 15, 20, 12, 6, 1, 1, 10, 45, 120, 190, 192, 140, 80, 30, 10, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
EXAMPLE
1; 1,1; 1,3,3,1; 1,6,15,20,12,6,1; ...
CROSSREFS
Rows sums give A085657. A085656(n) = Sum_{k=0..C(n, 2)} 2^k*T(n, k).
Sequence in context: A232967 A144163 A352472 * A144228 A083029 A084546
KEYWORD
nonn,tabf
AUTHOR
N. J. A. Sloane, Jul 13 2003
STATUS
approved

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Last modified March 18 22:34 EDT 2024. Contains 370951 sequences. (Running on oeis4.)