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A113377
Column 2 of triangle
A113374
, also equals column 0 of
A113381
^7.
3
1, 14, 252, 5957, 179270, 6641502, 294524076, 15285260326, 911664081027, 61573228385424, 4652227417900405, 389256081747220268, 35759870451009454561, 3580704593280285017869, 388344720309998846243731
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..14.
FORMULA
A113374
equals the matrix square of
A113370
, which has the property: column k of
A113370
^2 = column 0 of
A113381
^(3*k+1) for k>=0.
PROG
(PARI) a(n)=local(A, B); A=Mat(1); for(m=2, n+3, 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); (A^2)[n+3, 3]
CROSSREFS
Cf.
A113374
,
A113375
(column 0),
A113376
(column 1).
Sequence in context:
A074815
A280122
A051622
*
A318596
A343688
A159516
Adjacent sequences:
A113374
A113375
A113376
*
A113378
A113379
A113380
KEYWORD
nonn
AUTHOR
Paul D. Hanna
, Nov 14 2005
STATUS
approved
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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)