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 A109390 Entries in 3-dimensional solid related to Prouhet-Tarry problem. 4
 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 2, 5, 2, 1, 5, 5, 1, 1, 2, 1, 1, 1, 3, 7, 3, 3, 12, 12, 3, 1, 7, 12, 7, 1, 1, 3, 3, 1, 1, 1, 4, 9, 4, 6, 22, 22, 6, 4, 22, 36, 22, 4, 1, 9, 22, 22, 9, 1, 1, 1, 5, 11, 5, 10, 35, 35, 10, 10, 50, 80, 50, 10, 5, 35, 80, 80, 35, 5, 1, 11, 35, 50 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 COMMENTS Entries of slices [n,1] in A109672, read by rows. Slice [n,0] gives A046816, slice [0,k] gives A109649, slice [n,n] gives A109673, slice [1,k] gives A109393. LINKS FORMULA Sum of terms in 2D slice [n, 1] is 3^(n+1). EXAMPLE Slice [0,1]: ... 1 1 ... .... 1 .... Slice [1,1]: ... 1 1 ... .. 1 3 1 ... ... 1 1 ... Slice [2,1]: .... 1 1 .... ... 2 5 2 ... .. 1 5 5 1 ... ... 1 2 1 ... Slice [3,1]: ..... 1 1 ..... .... 3 7 3 .... ... 3 12 12 3 ... .. 1 7 12 7 1 ... ... 1 3 3 1 ... Slice [4,1]: ...... 1 1 ...... ..... 4 9 4 ..... .... 6 22 22 6 .... ... 4 22 36 22 4 ... .. 1 9 22 22 9 1 ... ... 1 4 6 4 1 ... Slice [5,1]: ....... 1 1 ....... ...... 5 11 5 ...... ..... 10 35 35 10 ..... .... 10 50 80 50 10 .... ... 5 35 80 80 35 5 ... .. 1 11 35 50 35 11 1 ... ... 1 5 10 10 5 1 ... CROSSREFS Cf. A109393. Sequence in context: A137578 A200146 A319095 * A130046 A262619 A166123 Adjacent sequences:  A109387 A109388 A109389 * A109391 A109392 A109393 KEYWORD nonn,tabf,easy AUTHOR Philippe Deléham, Aug 26 2005 STATUS approved

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Last modified December 10 04:15 EST 2019. Contains 329885 sequences. (Running on oeis4.)