Irregular triangle read by rows: T(n,k) is the number of endofunctions on [n] whose fourth-largest component has size exactly k; n >= 0, 0 <= k <= floor(n/4).

A350275

Irregular triangle read by rows: T(n,k) is the number of endofunctions on [n] whose fourth-largest component has size exactly k; n >= 0, 0 <= k <= floor(n/4).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =27a(4) =255a(5) =1a(6) =3094a(7) =31a(8) =45865a(9) =791a(10) =803424a(11) =20119a(12) =16239720a(13) =528991a(14) =8505a(15) =372076163a(16) =14689441a(17) =654885a(18) =9529560676a(19) =435580164a(20) =34859160a(21) =269819334245a(22) =13846282341a(23) =1646054025a(25) =471890017358a(26) =73811825010a(27) =1286223400

External references