cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A114153 Triangle, read by rows, given by the product R^-1*P^3 using triangular matrices P=A113370, R=A113389.

Original entry on oeis.org

1, 0, 1, 0, 6, 1, 0, 48, 12, 1, 0, 605, 186, 18, 1, 0, 11196, 3892, 414, 24, 1, 0, 280440, 106089, 12021, 732, 30, 1, 0, 8981460, 3620379, 429345, 27152, 1140, 36, 1, 0, 353283128, 149740555, 18386361, 1196910, 51445, 1638, 42, 1
Offset: 0

Views

Author

Paul D. Hanna, Nov 15 2005

Keywords

Comments

Complementary to A114152, which gives R^3*P^-1.

Examples

			Triangle R^-1*P^3 begins:
1;
0,1;
0,6,1;
0,48,12,1;
0,605,186,18,1;
0,11196,3892,414,24,1;
0,280440,106089,12021,732,30,1; ...
Compare to R^2 (A113392):
1;
6,1;
48,12,1;
605,186,18,1;
11196,3892,414,24,1;
280440,106089,12021,732,30,1; ...
Thus R^-1*P^3 equals R^2 shift right one column.
		

Crossrefs

Cf. A113392 (R^2), A113370 (P), A113381 (Q), A113389 (R); A114150 (R^2*Q^-1=Q^3*P^-2), A114151 (R^-2*Q^3=Q^-1*P^2), A114152 (R^3*P^-1), A114154 (R^3*Q^-2), A114155 (Q^-2*P^3); A114156 (P^-1), A114158 (Q^-1), A114159 (R^-1).

Programs

  • PARI
    T(n,k)=local(P,Q,R,W);P=Mat(1);for(m=2,n+1,W=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,W[i,j]=1,if(j==1, W[i,1]=1,W[i,j]=(P^(3*j-2))[i-j+1,1]));));P=W); Q=matrix(#P,#P,r,c,if(r>=c,(P^(3*c-1))[r-c+1,1])); R=matrix(#P,#P,r,c,if(r>=c,(P^(3*c))[r-c+1,1])); (R^-1*P^3)[n+1,k+1]

A114159 Triangle, read by rows, equal to the matrix inverse of R=A113389.

Original entry on oeis.org

1, -3, 1, 3, -6, 1, 35, -12, -9, 1, 396, -29, -45, -12, 1, 6237, 582, -462, -96, -15, 1, 131613, 30684, -6408, -1534, -165, -18, 1, 3518993, 1300810, -96705, -34020, -3515, -252, -21, 1, 114244366, 59124226, -764835, -944334, -102180, -6675, -357, -24, 1
Offset: 0

Views

Author

Paul D. Hanna, Nov 15 2005

Keywords

Examples

			Triangle R^-1 begins:
  1;
  -3,1;
  3,-6,1;
  35,-12,-9,1;
  396,-29,-45,-12,1;
  6237,582,-462,-96,-15,1;
  131613,30684,-6408,-1534,-165,-18,1;
  3518993,1300810,-96705,-34020,-3515,-252,-21,1;
  ...
Triangle R^-2 begins:
  1;
  -6,1;
  24,-12,1;
  79,30,-18,1;
  324,356,18,-24,1;
  42,5523,615,-12,-30,1;
  -79346,112533,16731,640,-60,-36,1;
  ...
		

Crossrefs

Cf. A113370 (P), A113381 (Q), A113389 (R); A114150 (R^2*Q^-1=Q^3*P^-2), A114151 (R^-2*Q^3=Q^-1*P^2), A114152 (R^3*P^-1), A114153 (R^-1*P^3), A114154 (R^3*Q^-2), A114155 (Q^-2*P^3); A114156 (P^-1), A114158 (Q^-1).

Programs

  • PARI
    {T(n,k)=local(P,Q,R,W);P=Mat(1);for(m=2,n+1,W=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,W[i,j]=1,if(j==1, W[i,1]=1,W[i,j]=(P^(3*j-2))[i-j+1,1]));));P=W); R=matrix(#P,#P,r,c,if(r>=c,(P^(3*c))[r-c+1,1])); (R^-1)[n+1,k+1]}

A113388 Column 0 of triangle A113387, also equals column 0 of A113389^2.

Original entry on oeis.org

1, 6, 48, 605, 11196, 280440, 8981460, 353283128, 16567072675, 905357065354, 56632746126107, 3997082539456084, 314584709388906568, 27340439653453247728, 2602372304420672868499, 269388182085308601450047
Offset: 0

Views

Author

Paul D. Hanna, Nov 14 2005

Keywords

Crossrefs

Programs

  • PARI
    a(n)=local(A,B);A=Mat(1);for(m=2,n+1,B=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,B[i,j]=1,if(j==1, B[i,1]=1,B[i,j]=(A^(3*j-2))[i-j+1,1]));));A=B); (matrix(#A,#A,r,c,if(r>=c,(A^(3*c-1))[r-c+1,1]))^3)[n+1,1]

Formula

A113387 equals the matrix cube of A113381, which has the property: column k of A113381^3 = column 0 of A113389^(3*k+2) for k>=0.

A113385 Column 0 of triangle A113384.

Original entry on oeis.org

1, 4, 22, 212, 3255, 70777, 2022897, 72375484, 3130502129, 159476810183, 9376968779265, 626244735454991, 46892450411406465, 3894861818247549265, 355651177699555693544, 35432761283736539730108
Offset: 0

Views

Author

Paul D. Hanna, Nov 14 2005

Keywords

Crossrefs

Cf. A113381, A113384, A113386 (column 1).

Programs

  • PARI
    a(n)=local(A,B);A=Mat(1);for(m=2,n+1,B=matrix(m,m); for(i=1,m, for(j=1,i,if(i<3 || j==i || j>m-1,B[i,j]=1,if(j==1, B[i,1]=1,B[i,j]=(A^(3*j-2))[i-j+1,1]));));A=B); (matrix(#A,#A,r,c,if(r>=c,(A^(3*c-1))[r-c+1,1]))^2)[n+1,1]

Formula

A113384 equals the matrix square of A113381, which has the property: column k of A113381^2 = column 0 of A113381^(3*k+2) for k>=0.
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