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!)
 A181645 Triangle Id-(xc(x),xc(x)), c(x) the g.f. of the Catalan numbers A000108. 2
 1, -1, 1, -1, -1, 1, -2, -2, -1, 1, -5, -5, -3, -1, 1, -14, -14, -9, -4, -1, 1, -42, -42, -28, -14, -5, -1, 1, -132, -132, -90, -48, -20, -6, -1, 1, -429, -429, -297, -165, -75, -27, -7, -1, 1, -1430, -1430, -1001, -572, -275, -110, -35, -8, -1, 1, -4862, -4862, -3432 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 COMMENTS Inverse is A181644, the eigentriangle of the Catalan triangle (c(x),xc(x)), A033184. LINKS EXAMPLE Triangle begins 1, -1, 1, -1, -1, 1, -2, -2, -1, 1, -5, -5, -3, -1, 1, -14, -14, -9, -4, -1, 1, -42, -42, -28, -14, -5, -1, 1, -132, -132, -90, -48, -20, -6, -1, 1, -429, -429, -297, -165, -75, -27, -7, -1, 1 CROSSREFS Sequence in context: A123585 A145668 A318405 * A129104 A232648 A295690 Adjacent sequences:  A181642 A181643 A181644 * A181646 A181647 A181648 KEYWORD easy,sign,tabl AUTHOR Paul Barry, Nov 03 2010 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 June 15 04:47 EDT 2021. Contains 345043 sequences. (Running on oeis4.)