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 A279403 Irregular triangle read by rows: T(n,k) (n>=1, 0 <= k <= n^2) = minimal number of squares not attacked by k queens on an n X n toroidal board, with trailing zeros truncated. 2
 1, 4, 9, 16, 4, 25, 8, 2, 36, 16, 4, 49, 24, 11, 4, 64, 36, 16, 6, 81, 48, 27, 12, 3, 100, 64, 36, 19, 4, 121, 80, 51, 29, 13, 144, 100, 64, 39, 16, 6, 169, 120, 83, 53, 29, 8, 2, 196, 144, 100, 67, 36, 18, 8, 225, 168, 223, 82, 41, 256, 196, 144, 103, 64, 40 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row lengths are A279402. LINKS FORMULA T(n,0) = A000290(n). T(n,1) = A000290(n)-A047461(n) = A137932(n-1). T(n,2) = A248825(n-4) for n >= 6. EXAMPLE The triangle begins: 1 (0) 4 (0, 0, 0, 0) 9 (0, 0, ...) 16 4 (0, 0, ...) 25 8 2 36 16 4 49 24 11 4 64 36 16 6 81 48 27 12 3 100 64 36 19 4 121 80 51 29 13 144 100 64 39 16 6 169 120 83 53 29 8 2 196 144 100 67 36 18 8 225 168 123 82 41 256 196 144 103 64 40 ... CROSSREFS Cf. A279402, A279406. Sequence in context: A070444 A120866 A070443 * A330377 A070643 A070442 Adjacent sequences:  A279400 A279401 A279402 * A279404 A279405 A279406 KEYWORD nonn,tabf AUTHOR Andrey Zabolotskiy, Dec 11 2016 STATUS approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)