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A113102 Column 1 of triangle A113101. 0
1, 20, 894, 108292, 39188597, 45157269264, 172969059719500, 2268555493366383236, 104065414379018585400528, 16965802042440759287849083708, 9953305892540385313201626908460431 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
PROG
(PARI) {a(n)=local(M=matrix(n+1, n+1)); for(r=1, n+1, for(c=1, r, M[r, c]=if(r==c, 1, if(c>1, (M^4)[r-1, c-1])+(M^4)[r-1, c]))); return(if(n<1, 0, (M^4)[n+1, 2]))}
CROSSREFS
Cf. A113101.
Sequence in context: A291112 A362168 A192370 * A285673 A250017 A305116
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Oct 14 2005
EXTENSIONS
Offset changed to 1 by Georg Fischer, Jun 20 2022
STATUS
approved

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)