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!)
 A091562 Triangle read by rows, related to Pascal's triangle. 3
 1, 0, 0, 1, 1, 1, 1, 2, 2, 1, 2, 5, 7, 5, 2, 3, 10, 17, 17, 10, 3, 5, 20, 41, 51, 41, 20, 5, 8, 38, 91, 136, 136, 91, 38, 8, 13, 71, 195, 339, 405, 339, 195, 71, 13, 21, 130, 403, 799, 1107, 1107, 799, 403, 130, 21, 34, 235, 812, 1807, 2845, 3297, 2845, 1807, 812, 235 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 LINKS FORMULA T(n, k) = T(n-1, k) + T(n-1, k-1) + T(n-2, k) + T(n-2, k-1) + T(n-2, j-2) for n >= 2, k >= 0, with initial conditions specified by first two rows. G.f. A(x, y) = (1-x-x*y)/(1-x-x*y-x^2-x^2*y-x^2*y^2). EXAMPLE 1; 0,0; 1,1,1; 1,2,2,1; 2,5,7,5,2; ... CROSSREFS Row sums: A054878. Columns 0-1: A000045(n-1), A001629. Cf. A090172. Sequence in context: A059594 A183760 A125678 * A106585 A057227 A335190 Adjacent sequences:  A091559 A091560 A091561 * A091563 A091564 A091565 KEYWORD nonn,easy,tabl AUTHOR Christian G. Bower, Jan 20 2004 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 15 00:20 EDT 2020. Contains 336484 sequences. (Running on oeis4.)