OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Complete Bipartite Graph
Eric Weisstein's World of Mathematics, Graph Path
FORMULA
a(1, n) = binomial(n + 1, 2).
a(2, n) = n*(n^2 + 2).
a(3, n) = 3/2*n*(-3 + 11*n - 6*n^2 + 2*n^3).
a(4, n) = 2*n*(70 - 152*n + 123*n^2 - 42*n^3 + 6*n^4).
a(n, n) = A288035(n).
EXAMPLE
1;
3,12;
6,33,135;
10,72,438,2224;
15,135,1140,8850,55725;
21,228,2511,27480,265665,2006316;
28,357,4893,70462,962010,11158203,98309827;
36,528,8700,156768,2818740,46176816,624859788,6291829440;
45,747,14418,313434,7054875,152212365,2909139912,...;
CROSSREFS
KEYWORD
AUTHOR
Eric W. Weisstein, Mar 20 2019
STATUS
approved