A328885 Improved version of A002686; secondary main diagonal of A324124.

1, 8, 45, 416, 1685, 31032, 229026, 13856896, 132843888, 6551143600, 672567897859, 346984064352, 51233511973865, 99704578224832, 1521740934249300, 87595020192056292864, 81891555365769626429, 12883000343953567644, 318718123756704667891346, 50107182570391966040000, 500792393469899639083500

Offset

1,2

Comments

Sequence A002686 has only 10 terms (from n = 1 to n = 10). We have a(n) = A002686(n) for 1 <= n <= 10 except for n = 7: a(7) = 229026 while A002686(7) = 1603182 (which is a(7) * 7 = 229026 * 7). For an explanation, see the comments for array A324124. This is necessary to give a unique definition to the terms of array A324124.

Links

Table of n, a(n) for n=1..21.

Petros Hadjicostas, Maple program.

Yudell L. Luke, Mechanical quadrature near a singularity, Math. Comp. 6 (1952), 215-219.

Crossrefs

Cf. A002685, A002686, A324124, A328866, A328884.

Sequence in context: A006887 A009369 A120044 * A002686 A306047 A110348

Adjacent sequences: A328882 A328883 A328884 * A328886 A328887 A328888

Keyword

nonn

Author

Petros Hadjicostas, Oct 29 2019

Status

approved