Mathematics · Permutations
[n] = {1, 2, ..., n} का एक क्रमपरिवर्तन (permutation) σ अपरिवर्तनीय (irreducible) कहलाता है, यदि प्रतिबंध σ| [k] किसी भी 1 ≤ k < n के लिए [k] का क्रमपरिवर्तन नहीं है। मान लीजिए a n , [n] के अपरिवर्तनीय क्रमपरिवर्तनों की संख्या है। यदि a 1 = 1, a 2 = 1, और a 3 = 3 है, तो a 4 का मान क्या है?
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