A374862 Obverse convolution A000201**A000201; see Comments.

0, 1, 18, 256, 5400, 153664, 4251528, 146410000, 5159780352, 215051077696, 10497600000000, 516094438514944, 28802430771288192, 1806336000000000000, 113638807576776480768, 7916729578225695719424, 558793544769287109375000, 42995640737555012867053824

Offset

0,3

Comments

See A374848 for the definition of obverse convolution and a guide to related sequences. a(2k+1) is a square for k>=0.

Links

Table of n, a(n) for n=0..17.

Mathematica

r = GoldenRatio;
s[n_] := Floor[n*r];
u[n_] := Product[s[k] + s[n - k], {k, 0, n}]
Table[u[n], {n, 0, 20}]

Crossrefs

Cf. A000201, A001622, A374848.

Sequence in context: A159537 A136660 A374880 * A362808 A365137 A255372

Adjacent sequences: A374859 A374860 A374861 * A374863 A374864 A374865

Keyword

nonn

Author

Clark Kimberling, Aug 18 2024

Status

approved