Zeroless factorials (version 2): a(0) = 1, and for any n > 0, a(n) = noz(1 * noz(2 * ... * noz((n-1) * n))), where noz(n) = A004719(n) omits the zeros from n.

A321475

Zeroless factorials (version 2): a(0) = 1, and for any n > 0, a(n) = noz(1 * noz(2 * ... * noz((n-1) * n))), where noz(n) = A004719(n) omits the zeros from n.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =12a(6) =72a(7) =54a(8) =432a(9) =3888a(10) =3888a(11) =399168a(12) =576a(13) =82728a(14) =879912a(15) =2397168a(16) =337968a(17) =5924736a(18) =8851949568a(19) =143936352a(20) =31644a(21) =92589264a(22) =118459638a(23) =3698784a(24) =1197539136a(25) =2387625984a(26) =954864a(27) =236271168a(28) =3573339984a(29) =238453776

External references