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!)
 A271480 Dimension of n-qubit subspace H^{MPS}_{2,n} for bond dimension 2. 0
 1, 2, 4, 8, 16, 30, 53, 88, 139, 210, 306, 432, 594, 798, 1051, 1360 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS M. Navascues, T. Vertesi, The Structure of Matrix Product States, arXiv preprint arXiv:1509.04507 [quant-ph], 2015. FORMULA Conjectures from Colin Barker, Apr 26 2016: (Start) a(n) = (93+3*(-1)^n+88*n+4*n^2+8*n^3+2*n^4)/96. a(n) = (n^4+4*n^3+2*n^2+44*n+48)/48 for n even. a(n) = (n^4+4*n^3+2*n^2+44*n+45)/48 for n odd. a(n) = 4*a(n-1)-5*a(n-2)+5*a(n-4)-4*a(n-5)+a(n-6) for n>5. G.f.: (1-2*x+x^2+2*x^3-x^4) / ((1-x)^5*(1+x)). (End) CROSSREFS Sequence in context: A098904 A248846 A046127 * A226454 A075529 A005305 Adjacent sequences:  A271477 A271478 A271479 * A271481 A271482 A271483 KEYWORD nonn,more AUTHOR N. J. A. Sloane, Apr 12 2016 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 August 14 09:14 EDT 2020. Contains 336480 sequences. (Running on oeis4.)