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A099241 Sums of antidiagonals of A099239. 1
1, 2, 4, 9, 22, 57, 155, 441, 1311, 4066, 13130, 44046, 153144, 550706, 2044248, 7819897, 30779570, 124487688, 516723174, 2198726181, 9581247648, 42717268934, 194688593966, 906331074605, 4306472500778, 20871165469241, 103106015116437 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

FORMULA

a(n)=sum{k=0..n, sum{j=0..n-k, binomial(k(n-k)-(k-1)(j-1), j)}

CROSSREFS

Sequence in context: A287709 A196161 A249561 * A249563 A124380 A176084

Adjacent sequences:  A099238 A099239 A099240 * A099242 A099243 A099244

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Oct 08 2004

STATUS

approved

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Last modified May 26 13:05 EDT 2019. Contains 323586 sequences. (Running on oeis4.)