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A115283
Diagonal sums of correlation triangle for 3-2*0^n.
1
1, 3, 6, 13, 18, 27, 37, 48, 60, 76, 90, 108, 127, 147, 168, 193, 216, 243, 271, 300, 330, 364, 396, 432, 469, 507, 546, 589, 630, 675, 721, 768, 816, 868, 918, 972, 1027, 1083, 1140, 1201, 1260, 1323, 1387, 1452, 1518, 1588, 1656, 1728, 1801
OFFSET
0,2
COMMENTS
Diagonal sums of number triangle A115282.
FORMULA
G.f.: (1+2x)(1+2x^2)/((1-x)(1-x^2)(1-x^3)); a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, [j<=k]*(3-2*0^(k-j))*[j<=n-2k]*(3-2*0^(n-2k-j))}}.
CROSSREFS
Sequence in context: A053569 A310123 A293794 * A078382 A075651 A091277
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jan 19 2006
STATUS
approved