Square array A(n, k) = sigma((2n-1)^2) * sigma((2k-1)^2), read by antidiagonals.

Terms

a(0) =1a(1) =13a(2) =13a(3) =31a(4) =169a(5) =31a(6) =57a(7) =403a(8) =403a(9) =57a(10) =121a(11) =741a(12) =961a(13) =741a(14) =121a(15) =133a(16) =1573a(17) =1767a(18) =1767a(19) =1573a(20) =133a(21) =183a(22) =1729a(23) =3751a(24) =3249a(25) =3751a(26) =1729a(27) =183a(28) =403a(29) =2379