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 A215542 a(n) = binomial(6*n,n)*(4*n+1)/(5*n+1). 2
 1, 5, 54, 663, 8602, 115101, 1570800, 21732542, 303719922, 4277470470, 60610884906, 863102246760, 12340998865104, 177064708142315, 2547927647834040, 36757054103054076, 531436857842656610, 7698470087956704210, 111712846834848074340, 1623556455926349703605 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Number of standard Young tableaux of shape [5n,n]. LINKS Alois P. Heinz, Table of n, a(n) for n = 0..260 Wikipedia, Young tableau FORMULA a(n) = C(6*n,n)*(4*n+1)/(5*n+1). a(n) = [x^n] ((1 - sqrt(1 - 4*x))/(2*x))^(4*n+1). - Ilya Gutkovskiy, Nov 01 2017 Recurrence: 5*n*(4*n - 3)*(5*n - 3)*(5*n - 2)*(5*n - 1)*(5*n + 1)*a(n) = 72*(2*n - 1)*(3*n - 2)*(3*n - 1)*(4*n + 1)*(6*n - 5)*(6*n - 1)*a(n-1). - Vaclav Kotesovec, Feb 03 2018 MAPLE a:= n-> binomial(6*n, n)*(4*n+1)/(5*n+1): seq(a(n), n=0..20); MATHEMATICA Table[Binomial[6n, n] (4n+1)/(5n+1), {n, 0, 30}] (* Harvey P. Dale, Mar 06 2014 *) CROSSREFS Column k=5 of A214776. Sequence in context: A087125 A110430 A110432 * A304322 A132619 A251583 Adjacent sequences: A215539 A215540 A215541 * A215543 A215544 A215545 KEYWORD nonn AUTHOR Alois P. Heinz, Aug 15 2012 STATUS approved

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Last modified February 9 08:37 EST 2023. Contains 360154 sequences. (Running on oeis4.)