A039803 Column 4 of inverse partition triangle A038498.

1, -1, -1, 0, 0, 2, 1, 1, 0, -1, -1, -2, -3, -3, -2, -2, 0, 1, 3, 4, 6, 7, 9, 8, 10, 9, 8, 6, 3, -2, -5, -10, -16, -20, -27, -32, -37, -40, -44, -43, -47, -42, -42, -34, -30, -18, -12, 7, 17, 39, 53, 76, 92, 118, 133, 158, 175, 196, 210, 226, 237, 244

Offset

4,6

Links

David A. Corneth, Table of n, a(n) for n = 4..2003

Prog

(PARI) first(n) = { my(m = matrix(n + 4, n + 4)); for(i = 2, n + 4, m[i, i] = 1; ); for(k = 2, n + 4, for(i = k + 1, n + 4, m[i, k] = m[i - (k-1), k] + m[i-1, k-1] ) ); m = matrix(n + 3, n + 3, i, j, m[i + 1, j + 1])^-1; vector(n, i, m[i + 3, 4]) } \\ David A. Corneth, Feb 27 2021

Crossrefs

Cf. A038498, A039800, A039801, A039802, A039804.

Sequence in context: A156749 A340390 A325280 * A360118 A147809 A325144

Adjacent sequences: A039800 A039801 A039802 * A039804 A039805 A039806

Keyword

sign,look

Author

Christian G. Bower, Feb 15 1999

Extensions

a(63) onward corrected by Sean A. Irvine, Feb 27 2021

Status

approved