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Alois P. Heinz, <a href="/A301481/b301481_1.txt">Table of n, a(n) for n = 0..14</a> (first 13 terms from Andrew Howroyd)
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Andrew Howroyd, Alois P. Heinz, <a href="/A301481/b301481_1.txt">Table of n, a(n) for n = 0..1214</a> (first 13 terms from Andrew Howroyd)
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(PARI) \\ see A301922 for U(n, k).
a(n)={ if(n==0, 1, sum(k=1, n, U(n, k)-U(n-1, k))) } \\ Andrew Howroyd, Aug 10 2019
1, 1, 1, 2, 4, 12, 58, 2381, 14026281, 29284932065996445, 468863491068204425232922367150021, 1994324729204021501147398087008429476673379600542622915802043462326345
0,43
Andrew Howroyd, <a href="/A301481/b301481.txt">Table of n, a(n) for n = 0..12</a>
nonn,more
nonn
Terms a(6) and beyond from Andrew Howroyd, Aug 09 2019
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