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0,2
Partial sums of A098331. Binomial transform of A128057. Hankel transform is A128056.
Table of n, a(n) for n=0..29.
a(n)=sum{k=0..n, sum{j=0..k, C(k,j)*C(k-j,j)*(-1)^j}}
Sequence in context: A183244 A086933 A077878 * A163236 A077160 A228043
Adjacent sequences: A128055 A128056 A128057 * A128059 A128060 A128061
easy,sign
Paul Barry, Feb 13 2007
approved