The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A185625 Column 0 of triangle A185624; also, equals row sums of triangle A185620. 3
 1, 2, 3, 6, 18, 79, 463, 3396, 30073, 314037, 3796561, 52332869, 812013163, 14029926801, 267461387125, 5581705418715, 126657160962835, 3106644875467396, 81943115662983569, 2313753122033185373, 69654973411269008826, 2227679407193350385775 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Triangle A185624 equals the matrix square of triangle R = A185620, which satisfies: R^3 - R^2 + I = R shifted left one column. LINKS Table of n, a(n) for n=0..21. PROG (PARI) {a(n)=local(A=Mat(1), B); for(m=1, n, B=A^3-A^2+A^0; A=matrix(m+1, m+1); for(i=1, m+1, for(j=1, i, if(i<2|j==i, A[i, j]=1, if(j==1, A[i, j]=1, A[i, j]=B[i-1, j-1]))))); return((A^2)[n+1, 1])} CROSSREFS Cf. A185620, A185624, A185626, A185627, A185628. Sequence in context: A038056 A072241 A093468 * A114302 A000304 A000614 Adjacent sequences: A185622 A185623 A185624 * A185626 A185627 A185628 KEYWORD nonn AUTHOR Paul D. Hanna, Sep 07 2011 STATUS approved

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

Last modified May 31 11:52 EDT 2023. Contains 363066 sequences. (Running on oeis4.)