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 A107731 Row 7 of the array in A107735. 1
 1, 21, 141, 521, 1401, 3101, 6021, 10641, 17521, 27301, 40701, 58521, 81641, 111021, 147701, 192801, 247521, 313141, 391021, 482601, 589401, 713021, 855141, 1017521, 1202001, 1410501, 1645021, 1907641, 2200521, 2525901, 2886101, 3283521 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES S. Mukai, An Introduction to Invariants and Moduli, Cambridge, 2003; see p. 483. LINKS Table of n, a(n) for n=0..31. FORMULA a(n) = 1 + (n^2+n)*(n^2+n+1)*10/3. a(-1-n)= a(n). - Michael Somos, Mar 20 2007 G.f.: (1 + 16*x + 46*x^2 + 16*x^3 + x^4)/(1-x)^5. - Michael Somos, Mar 20 2007; corrected by Georg Fischer, Apr 17 2020 MATHEMATICA nn:=31; CoefficientList[Series[(1 + 16*x + 46*x^2 + 16*x^3 + x^4)/(1-x )^5, {x, 0, nn}], x] (* Georg Fischer, Apr 17 2020 *) PROG (PARI) {a(n)= 1+ (n^2+n)* (n^2+n+1)* 10/3} /* Michael Somos, Mar 20 2007 */ CROSSREFS Sequence in context: A220151 A337899 A200987 * A003702 A221785 A301866 Adjacent sequences: A107728 A107729 A107730 * A107732 A107733 A107734 KEYWORD nonn AUTHOR N. J. A. Sloane, Jun 10 2005 EXTENSIONS More terms from Michael Somos, Mar 20 2007 STATUS approved

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Last modified November 29 09:35 EST 2023. Contains 367429 sequences. (Running on oeis4.)