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A027208 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026725. 1
1, 4, 19, 72, 338, 1289, 6027, 23117, 107746, 415058, 1929383, 7456777, 34584731, 134005510, 620344059, 2408498148, 11131638368, 43289074671, 199800878749, 778025282080, 3586777011141, 13982303458588, 64394916131100, 251261623174835, 1156165698462868, 4514741175877259 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MAPLE
A027208 := proc(n)
add( A026725(n, k)*A026725(n, k+1), k=0..n-1) ;
end proc: # R. J. Mathar, Oct 21 2019
CROSSREFS
Sequence in context: A219972 A284224 A268214 * A085348 A027232 A256714
KEYWORD
nonn
AUTHOR
EXTENSIONS
Name corrected by R. J. Mathar, Oct 21 2019
More terms from Sean A. Irvine, Oct 24 2019
STATUS
approved

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Last modified April 13 08:52 EDT 2024. Contains 371638 sequences. (Running on oeis4.)