A023990 Sum of exponents of primes in multinomial coefficient M(4n; 2n,n,n)/M(3n; n,n,n).

1, 1, 1, 2, 2, 1, 3, 3, 4, 4, 1, 2, 4, 3, 3, 5, 4, 4, 3, 4, 7, 4, 4, 5, 7, 5, 4, 5, 5, 6, 6, 7, 7, 9, 7, 9, 11, 8, 9, 9, 9, 8, 6, 7, 7, 6, 6, 8, 9, 8, 8, 9, 10, 7, 8, 9, 10, 11, 7, 8, 11, 11, 10, 12, 13, 13, 12, 11, 14, 12, 11, 13, 14, 12, 12, 14, 14, 13, 14, 14, 15, 15, 13, 14, 14, 11, 10, 13, 12, 13, 13, 12, 15

Offset

1,4

Links

Table of n, a(n) for n=1..93.

Crossrefs

Sequence in context: A286558 A368153 A355668 * A117894 A177762 A109380

Adjacent sequences: A023987 A023988 A023989 * A023991 A023992 A023993

Keyword

nonn

Author

Clark Kimberling

Status

approved