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 A261219 Main diagonal of A261216: a(n) = A261216(n,n). 7
 0, 0, 0, 5, 0, 3, 0, 0, 14, 16, 22, 20, 0, 19, 8, 20, 0, 7, 0, 13, 0, 7, 10, 16, 0, 0, 0, 5, 0, 3, 54, 54, 60, 65, 66, 69, 84, 90, 78, 95, 84, 81, 114, 108, 114, 107, 102, 111, 0, 0, 74, 76, 100, 98, 30, 30, 78, 83, 102, 105, 0, 19, 26, 45, 100, 119, 0, 13, 74, 87, 28, 41, 0, 97, 50, 98, 0, 49, 0, 97, 26, 117, 22, 47, 36, 108, 60, 113, 36, 63, 0, 25, 50, 33, 10, 59, 0, 73, 0, 49, 52 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS Equally: main diagonal of A261217. For permutation p, which has rank n in permutation list A060117, a(n) gives the rank of the "square" of that permutation (obtained by composing it with itself as: q(i) = p(p(i))) in the same list. Equally, if permutation p has rank n in the order used in list A060118, a(n) gives the rank of the p*p in that same list. Thus zeros (which mark the identity permutation, with rank 0 in both orders) occur at positions where the permutations of A060117 (equally: of A060118) are involutions, listed by A261220. LINKS Antti Karttunen, Table of n, a(n) for n = 0..5040 FORMULA a(n) = A261216(n,n) = A261217(n,n). By conjugating a similar sequence: a(n) = A060126(A261099(A060119(n))). CROSSREFS Main diagonal of A261216 and A261217. Cf. A261220 (the positions of zeros). Cf. A060117, A060118. Cf. also A261099, A089841. Related permutations: A060119, A060126. Sequence in context: A019106 A051566 A051567 * A085850 A176867 A229175 Adjacent sequences:  A261216 A261217 A261218 * A261220 A261221 A261222 KEYWORD nonn AUTHOR Antti Karttunen, Aug 26 2015 STATUS approved

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Last modified October 20 10:25 EDT 2019. Contains 328257 sequences. (Running on oeis4.)