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A099240 Main diagonal of A099239. 1
1, 2, 8, 41, 250, 1757, 13917, 122166, 1173662, 12222605, 136927351, 1639768418, 20880556880, 281460326864, 4000651782511, 59761935358025, 935445106491702, 15303039199768237, 261030618751031385, 4632889302298054713 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n)=sum{j=0..n, binomial(n^2-(n-1)(j-1), j)}; a(n)=sum{j=0..n, binomial(n+(n-1)(j+1), n(j+1)-1}.

CROSSREFS

Sequence in context: A177340 A067119 A093935 * A134055 A136281 A125698

Adjacent sequences:  A099237 A099238 A099239 * A099241 A099242 A099243

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Oct 08 2004

STATUS

approved

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Last modified September 20 18:26 EDT 2018. Contains 315240 sequences. (Running on oeis4.)