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 A046653 Triangle of rooted planar maps. 4
 1, 1, 1, 1, 1, 2, 1, 2, 3, 4, 1, 2, 8, 12, 14, 1, 3, 12, 30, 43, 49, 1, 3, 22, 63, 134, 189, 216, 1, 4, 31, 133, 323, 608, 888, 984, 1, 4, 48, 238, 759, 1671, 2988, 4332, 4862, 1, 5, 64, 422, 1594, 4260, 8772, 15126, 22011, 24739, 1, 5, 90, 694, 3210, 10002, 23986, 46923, 79214, 115131, 130338, 1, 6, 115, 1106, 6024, 22176, 60813, 135097, 255277, 424034, 616395, 701584 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 2,6 LINKS Table of n, a(n) for n=2..79. W. G. Brown, Enumeration of non-separable planar maps, Canad. J. Math., 15 (1963), 526-545. W. G. Brown, Enumeration of non-separable planar maps [Annotated scanned copy] FORMULA Reference gives generating functions. EXAMPLE Triangle begins: 1; 1, 1; 1, 1, 2; 1, 2, 3, 4; 1, 2, 8, 12, 14; 1, 3, 12, 30, 43, 49; ... MAPLE # uses function L(., .) from A046650 for n from 2 to 13 do for m from n to 2 by -1 do printf("%d, ", L(n, m)) ; end do: printf("\n") ; end do: # R. J. Mathar, Apr 13 2019 CROSSREFS Cf. A046650 (diagonal), A000087 (row sums). Sequence in context: A309776 A255560 A328472 * A308897 A353293 A162190 Adjacent sequences: A046650 A046651 A046652 * A046654 A046655 A046656 KEYWORD tabl,nonn,easy AUTHOR N. J. A. Sloane EXTENSIONS More terms from R. J. Mathar, Apr 13 2019 STATUS approved

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Last modified May 26 02:43 EDT 2024. Contains 372807 sequences. (Running on oeis4.)