This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A129275 Column 1 of triangle A129274; a(n) is the coefficient of q^(n+2) in the squared q-factorial of n+2. 2
 1, 10, 71, 474, 3103, 20190, 131204, 853176, 5555674, 36237258, 236763125, 1549496420, 10156512792, 66669881442, 438226458380, 2884072387268, 19002479773355, 125335000366692, 827479642104143, 5468060901435850 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Robert Israel, Table of n, a(n) for n = 0..300 Eric Weisstein's World of Mathematics, q-Factorial from MathWorld. FORMULA a(n) = [q^(n+2)] Product_{i=1..n+2} { (1-q^i)/(1-q) }^2. MAPLE P:= (1+q)^2: A[0]:= 1: for n from 1 to 50 do   P:= normal(P * (1-q^(n+2))^2/(1-q)^2);   A[n]:= coeff(P, q, n+2); od: seq(A[i], i=0..50); # Robert Israel, Jun 25 2018 PROG (PARI) a(n)=polcoeff(prod(i=1, n+2, (1-x^i)/(1-x))^2, n+2) CROSSREFS Cf. A129274. Sequence in context: A026772 A224292 A016098 * A049672 A221548 A037579 Adjacent sequences:  A129272 A129273 A129274 * A129276 A129277 A129278 KEYWORD nonn AUTHOR Paul D. Hanna, Apr 07 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 21 06:39 EDT 2019. Contains 328292 sequences. (Running on oeis4.)