27860

Appears in sequences

• Convolution of A000203 with itself.at n=39A000385
• Coefficients in quasimodular form F_2(q) of level 1 and weight 6.at n=20A126858
• Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1 <= k <= m positions can be picked in an m X m square grid such that the picked positions have a central symmetry.at n=39A291717
• Inverse matrix of A135494.at n=22A298673
• Indices of 0 in A348295: numbers m such that Sum_{k=1..m} (-1)^(floor(k*(sqrt(2)-1))) = Sum_{k=1..m} (-1)^A097508(k) = 0.at n=36A348299