53729

Appears in sequences

• a(n) is the sum of squares of the first n positive integers congruent to 2 mod 3.at n=25A024394
• Coefficients in the series (1 + 2x^2 + 3x^3 + 5x^5 + 7x^7 + 11x^11 + 13x^13 + ... )/(1 - x - 4x^4 - 6x^6 - 8x^8 - 9x^9 - 10x^10 - 12x^12 - 14x^14 - ... ).at n=17A058356
• Number of nonisomorphic unordered pairs of involutions on an n-set.at n=27A362649