The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A085143 Triangle table from number wall of reversion of Fibonacci numbers. 0
 1, -1, -1, -1, -1, -1, 1, 0, 2, 1, 1, -2, 4, 3, 1, -1, 3, -11, -5, -5, -1, -1, -1, -34, 10, -20, -8, -1, 1, 11, 106, -116, 96, 44, 13, 1, 1, 15, 368, -328, 716, 86, 125, 21, 1, -1, 13, -1324, -1344, -5634, 1866, -1063, -316, -34, -1, -1, 77, -4811, -17235 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 LINKS FORMULA T(n, k)=det(a(i+j-1+k-n)_{i, j=1..n}) where a(n)=A007440(n). T(n, k)=(-1)^[(n+k-1)/2]*T(k-1, n-1) if 1<=k<=n. EXAMPLE 1; -1,-1; -1,-1,-1; 1,0,2,1; 1,-2,4,3,1; -1,3,-11,-5,-5,-1; ... T(4,2)=0 since det([0,0,1,-1; 0,1,-1,0; 1,-1,0,2; -1,0,2,-3])=0. PROG (PARI) {a(n)=polcoeff((-1-x+sqrt(1+2*x+5*x^2+x^2*O(x^n)))/(2*x), n)}{T(n, k)=matdet(matrix(n, n, i, j, a(i+j-1+k-n)))} CROSSREFS Cf. A007440. Sequence in context: A293819 A027113 A096470 * A321029 A253473 A026120 Adjacent sequences:  A085140 A085141 A085142 * A085144 A085145 A085146 KEYWORD sign,tabl AUTHOR Michael Somos, Jun 19 2003 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 11 21:35 EDT 2021. Contains 343808 sequences. (Running on oeis4.)